Ref #1106

Combination of a couple of PRs linked below

• plots.py overhaul #912
• Plot overhaul + Auto balance map #1102
• First try Plotting library #1118

Changes proposed in this Pull Request

EDIT:

Syntax

# Statistics plots
# Simplified, only essential arguments
n.statistics.energy_balance.plot()
n.statistics.energy_balance.plot(kind='bar')
# Expert mode, all arguments, but yields same result as default
n.statistics.energy_balance.plot.bar()

# Global plots
n.plot.map()  # moved from n.plot()
n.plot.explore()  # moved from n.explore()
n.plot.sankey_diagram()  # not yet implemented
n.plot.topology()  # not yet implemented

ToDos

Required

• nice_names is still broken
• Should row/ col maybe be renamed to facet_row, facet_col or even be combined into facet?
• static vs time series default args in manage_parameters
• Still improve .maps(). Choose which stats kwargs are needed/ don't pass stat_kwargs as argument.
• Better integration of maps.py with /statistics.
• Neat docstring for n.plot.x.map()
• Check that all plots in any combination work with default parameters
  • .area(stacked=True) is currently broken
• Change charts from seaborn.objects.Plots to classic matplotlib Figure, Ax integration
• Apply new discussed syntax: statistics plots to n.statistics
• Better errors and warnings
  • Wrong kwargs which are passed through
  • Unsupported statistics kwargs
  • Unknown carrier columns/ carrier
• Move n.plot, explorer, iplot
• More unit tests, check coverage
• Find better way to test plots
• We might also wanna add /plot to linting
• A note for the release notes doc/release_notes.rst of the upcoming release is included.
• I consent to the release of this PR's code under the MIT license.

Optional (other PRs)

• Patch docstrings with actual default value from schema
• Documentation (maybe moved to another PR, since those interfer with statistics package)