Retire analyze_pg and multi folder

[BainanXia]

Pull Request doc

Purpose

Retire analyze_pg module and everything in multi folder. New functions are implemented to refactor these modules in

• multi:
  generation vs capacity bar charts: Implement bar charts for generation vs capacity #215
  generation vs capacity pie charts: Implement pie chart generation vs capacity #231
  shortfall bar charts: Implement shortfall bar chart #240
• analyze_pg
  time series generation stack plot & time series curtailment plot: Factor out generation and curtailment plots #201

What the code is doing

No new code. Deleting all the retired modules + demo notebooks

Testing

All tests still pass.

Where to look

list of files deleted:

• /postreise/plot/analyze_pg.py
• /postreise/plot/multi/*
• /postreise/plot/demo/bar_chart_demo.ipynb
• /postreise/plot/demo/capacity_factor_demo.ipynb
• /postreise/plot/demo/generation_stack_area_demo.ipynb
• /postreise/plot/demo/bar_hbar_pie_shortfall_multi_demo.ipynb

Time estimate

5 min

[rouille]

Feels good