* Merge initialize and initializeData in SolverInterfaceImpl.
* Merge initialize and initializeData in CouplingScheme.
* Update tests correspondingly
* Allow to check actions before initialize, especially checking whether initial data has to be written
* Check for sending and receiving of initial data during coupling scheme configuration
* Code simplification w.r.t waveform.
* Use dt=0.0 in actions in initialize.

Co-authored-by: Benjamin Uekermann <[email protected]>
Co-authored-by: Frédéric Simonis <[email protected]>

* Merge initialize and initializeData in SolverInterfaceImpl.
* Merge initialize and initializeData in CouplingScheme.
* Update tests correspondingly
* Allow to check actions before initialize, especially checking whether initial data has to be written
* Check for sending and receiving of initial data during coupling scheme configuration
* Code simplification w.r.t waveform.
* Use dt=0.0 in actions in initialize.

Co-authored-by: Benjamin Uekermann <[email protected]>
Co-authored-by: Frédéric Simonis <[email protected]>

* Merge initialize and initializeData in SolverInterfaceImpl.
* Merge initialize and initializeData in CouplingScheme.
* Update tests correspondingly
* Allow to check actions before initialize, especially checking whether initial data has to be written
* Check for sending and receiving of initial data during coupling scheme configuration
* Code simplification w.r.t waveform.
* Use dt=0.0 in actions in initialize.

Co-authored-by: Benjamin Uekermann <[email protected]>
Co-authored-by: Frédéric Simonis <[email protected]>

* Merge initialize and initializeData in SolverInterfaceImpl.
* Merge initialize and initializeData in CouplingScheme.
* Update tests correspondingly
* Allow to check actions before initialize, especially checking whether initial data has to be written
* Check for sending and receiving of initial data during coupling scheme configuration
* Code simplification w.r.t waveform.
* Use dt=0.0 in actions in initialize.

Co-authored-by: Benjamin Uekermann <[email protected]>
Co-authored-by: Frédéric Simonis <[email protected]>

* Merge initialize and initializeData in SolverInterfaceImpl.
* Merge initialize and initializeData in CouplingScheme.
* Update tests correspondingly
* Allow to check actions before initialize, especially checking whether initial data has to be written
* Check for sending and receiving of initial data during coupling scheme configuration
* Code simplification w.r.t waveform.
* Use dt=0.0 in actions in initialize.

Co-authored-by: Benjamin Uekermann <[email protected]>
Co-authored-by: Frédéric Simonis <[email protected]>

* Merge initialize and initializeData in SolverInterfaceImpl.
* Merge initialize and initializeData in CouplingScheme.
* Update tests correspondingly
* Allow to check actions before initialize, especially checking whether initial data has to be written
* Check for sending and receiving of initial data during coupling scheme configuration
* Code simplification w.r.t waveform.
* Use dt=0.0 in actions in initialize.

Co-authored-by: Benjamin Uekermann <[email protected]>
Co-authored-by: Frédéric Simonis <[email protected]>

* Merge initialize and initializeData in SolverInterfaceImpl.
* Merge initialize and initializeData in CouplingScheme.
* Update tests correspondingly
* Allow to check actions before initialize, especially checking whether initial data has to be written
* Check for sending and receiving of initial data during coupling scheme configuration
* Code simplification w.r.t waveform.
* Use dt=0.0 in actions in initialize.

Co-authored-by: Benjamin Uekermann <[email protected]>
Co-authored-by: Frédéric Simonis <[email protected]>

* Merge initialize and initializeData in SolverInterfaceImpl.
* Merge initialize and initializeData in CouplingScheme.
* Update tests correspondingly
* Allow to check actions before initialize, especially checking whether initial data has to be written
* Check for sending and receiving of initial data during coupling scheme configuration
* Code simplification w.r.t waveform.
* Use dt=0.0 in actions in initialize.

Co-authored-by: Benjamin Uekermann <[email protected]>
Co-authored-by: Frédéric Simonis <[email protected]>

* Merge initialize and initializeData in SolverInterfaceImpl.
* Merge initialize and initializeData in CouplingScheme.
* Update tests correspondingly
* Allow to check actions before initialize, especially checking whether initial data has to be written
* Check for sending and receiving of initial data during coupling scheme configuration
* Code simplification w.r.t waveform.
* Use dt=0.0 in actions in initialize.

Co-authored-by: Benjamin Uekermann <[email protected]>
Co-authored-by: Frédéric Simonis <[email protected]>

* Remove mapWriteDataFrom (precice/precice#1222) and Vertex-only API (precice/precice#1322)

* Remove `initializeData` (precice/precice#1350)

* Remove `isReadDataAvailable` and `isWriteDataRequired` (precice/precice#1362)

* Rename `isGradientDataRequired` (precice/precice@632b4fb)

* Remove `isActionRequired` and replace with explicit calls

* Adjust Solverdummies and tests

* Format changes

* [WIP]  Use names instead of IDs  related to precice/precice#1588

* Delete functions not part of the precice API

* Implement API changes into tests

* Format