This reverts commit 5c8e0c5.

This reverts commit 5c8e0c5.

Git 2.24 introduced a feature flag for repositories with many files, see:
https://github.blog/2019-11-03-highlights-from-git-2-24/#feature-macros

Since Spack's Git repository contains roughly 8,500 files, it can be
worthwhile to enable this, especially on slow file systems such as NFS:
```
$ hyperfine --warmup 3 'cd spack-default; git status' 'cd spack-manyfiles; git status'
Benchmark #1: cd spack-default; git status
  Time (mean ± σ):      3.388 s ±  0.095 s    [User: 256.2 ms, System: 625.8 ms]
  Range (min … max):    3.168 s …  3.535 s    10 runs

Benchmark #2: cd spack-manyfiles; git status
  Time (mean ± σ):     168.7 ms ±  10.9 ms    [User: 98.6 ms, System: 126.1 ms]
  Range (min … max):   144.8 ms … 188.0 ms    19 runs

Summary
  'cd spack-manyfiles; git status' ran
   20.09 ± 1.42 times faster than 'cd spack-default; git status'
```

1. support version 3.1.3, which now depends on sundials@6

2. support version 3.1.2:, which broke the two patch files and
   therefore the two patch files have been replaced by more flexible
   filter_file() commands inside a patch() function.

3. rename the variant for python extension from using the package name
   "+pyuqtk" to the more standard "+python"

4. add maintainers @omsai and the upstream developer @bjdebus who
   offered to help with the spack packaging.

5. swig should only be a build-time dependency.  swig is only
   necessary until @:3.1.0

6. confirmed python dependencies are correct by inspecting imports,
   subset python dependencies type to build, run, and confirmed all
   31 build-time tests pass including the 9 python tests:

```console
$ spack env create uqtk-dev
$ spack add [email protected]
$ spack install --test root && cat $(spack location -i uqtk)/.spack/install-time-test-log.txt
==> Testing package uqtk-3.1.3-nok6fut
==> [2023-04-19-14:56:25.005361] Running build-time tests
==> [2023-04-19-14:56:25.005536] RUN-TESTS: build-time tests [check]
==> [2023-04-19-14:56:25.009543] '/home/omsai/src/spack/opt/spack/linux-pureos10-skylake/gcc-10.2.1/gmake-4.4.1-b6g4apmfvxz3bn4eabh37dehcrg65fj7/bin/make' '-j4' '-n' 'test'
==> [2023-04-19-14:56:25.014903] '/home/omsai/src/spack/opt/spack/linux-pureos10-skylake/gcc-10.2.1/gmake-4.4.1-b6g4apmfvxz3bn4eabh37dehcrg65fj7/bin/make' '-j4' 'test'
Running tests...
/home/omsai/src/spack/opt/spack/linux-pureos10-skylake/gcc-10.2.1/cmake-3.26.3-zjmsfz23j5l4ytniz26uzvxonlu5qebr/bin/ctest --force-new-ctest-process
Test project /tmp/omsai/spack-stage/spack-stage-uqtk-3.1.3-nok6fut47h42cnaau7wkoohgqy5f2qqa/spack-build-nok6fut
      Start  1: ArrayReadAndWrite
      Start  2: ArrayDelColumn
      Start  3: Array1DMiscTest
      Start  4: Array2DMiscTest
 1/31 Test  #1: ArrayReadAndWrite ................   Passed    0.01 sec
      Start  5: ArraySortTest
 2/31 Test  #2: ArrayDelColumn ...................   Passed    0.01 sec
      Start  6: MultiIndexTest
 3/31 Test  #3: Array1DMiscTest ..................   Passed    0.01 sec
      Start  7: CorrTest
 4/31 Test  #4: Array2DMiscTest ..................   Passed    0.01 sec
      Start  8: QuadLUTest
 5/31 Test  #5: ArraySortTest ....................   Passed    0.02 sec
      Start  9: MCMC2dTest
 6/31 Test  #6: MultiIndexTest ...................   Passed    0.01 sec
      Start 10: MCMCRandomTest
 7/31 Test  #8: QuadLUTest .......................   Passed    0.02 sec
      Start 11: MCMCNestedTest
 8/31 Test #10: MCMCRandomTest ...................   Passed    0.02 sec
      Start 12: Deriv1dTest
 9/31 Test #12: Deriv1dTest ......................   Passed    0.01 sec
      Start 13: SecondDeriv1dTest
10/31 Test #13: SecondDeriv1dTest ................   Passed    0.01 sec
      Start 14: GradHessianTest
11/31 Test #11: MCMCNestedTest ...................   Passed    0.03 sec
      Start 15: GradientPCETest
12/31 Test #14: GradHessianTest ..................   Passed    0.01 sec
      Start 16: PCE1dTest
13/31 Test #15: GradientPCETest ..................   Passed    0.01 sec
      Start 17: PCEImplTest
14/31 Test #16: PCE1dTest ........................   Passed    0.01 sec
      Start 18: PCELogTest
15/31 Test #18: PCELogTest .......................   Passed    0.01 sec
      Start 19: Hessian2dTest
16/31 Test #19: Hessian2dTest ....................   Passed    0.01 sec
      Start 20: BCS1dTest
17/31 Test #20: BCS1dTest ........................   Passed    0.01 sec
      Start 21: BCS2dTest
18/31 Test #21: BCS2dTest ........................   Passed    0.01 sec
      Start 22: LowRankRegrTest
19/31 Test #22: LowRankRegrTest ..................   Passed    0.01 sec
      Start 23: PyModTest
20/31 Test #17: PCEImplTest ......................   Passed    0.07 sec
      Start 24: PyArrayTest
21/31 Test #23: PyModTest ........................   Passed    0.08 sec
      Start 25: PyArrayTest2
22/31 Test #25: PyArrayTest2 .....................   Passed    0.30 sec
      Start 26: PyQuadTest
23/31 Test #24: PyArrayTest ......................   Passed    1.44 sec
      Start 27: PyBCSTest1D
24/31 Test #26: PyQuadTest .......................   Passed    1.68 sec
      Start 28: PyBCSTest2D
25/31 Test #27: PyBCSTest1D ......................   Passed    1.66 sec
      Start 29: PyBADPTest
26/31 Test  #7: CorrTest .........................   Passed    3.43 sec
      Start 30: PyRegressionTest
27/31 Test #28: PyBCSTest2D ......................   Passed    1.50 sec
      Start 31: PyGalerkinTest
28/31 Test  #9: MCMC2dTest .......................   Passed    3.90 sec
29/31 Test #29: PyBADPTest .......................   Passed    1.66 sec
30/31 Test #30: PyRegressionTest .................   Passed    1.72 sec
31/31 Test #31: PyGalerkinTest ...................   Passed    1.63 sec

100% tests passed, 0 tests failed out of 31

Total Test time (real) =   5.35 sec
==> [2023-04-19-14:56:30.382797] '/home/omsai/src/spack/opt/spack/linux-pureos10-skylake/gcc-10.2.1/gmake-4.4.1-b6g4apmfvxz3bn4eabh37dehcrg65fj7/bin/make' '-j4' '-n' 'check'
==> [2023-04-19-14:56:30.385983] Target 'check' not found in Makefile
```

…ck#37560)

Co-authored-by: Harmen Stoppels <[email protected]>