added some rail scripts

[eacharles]

I've added a command line rail command and some scripts that do useful things:

(rail-test) PC100868$ rail --help
Usage: rail [OPTIONS] COMMAND [ARGS]...

  RAIL utility scripts

Options:
  --version  Show the version and exit.
  --help     Show this message and exit.

Commands:
  clone-source  Install packages from source
  install       pip install rail packages one by one, to be fault tolerant
  render-nb     Render jupyter notebooks

(rail-test) PC100868$ rail clone-source --help
Usage: rail clone-source [OPTIONS]

  Install packages from source

Options:
  --outdir PATH               Output directory.
  --git-mode [ssh|https|cli]  Git Clone mode
  --dry-run                   Dry run only
  --package-file PATH         File with package
  --help                      Show this message and exit.

(rail-test) PC100868$ rail install --help
Usage: rail install [OPTIONS]

  pip install rail packages one by one, to be fault tolerant

Options:
  --outdir PATH        Output directory.
  --dry-run            Dry run only
  --from-source        Install from source
  --package-file PATH  File with package
  --help               Show this message and exit.

(rail-test) PC100868$ rail clone-source --help
Usage: rail clone-source [OPTIONS]

  Install packages from source

Options:
  --outdir PATH               Output directory.
  --git-mode [ssh|https|cli]  Git Clone mode
  --dry-run                   Dry run only
  --package-file PATH         File with package
  --help                      Show this message and exit.

[codecov]

Codecov Report

Patch coverage: 54.47% and project coverage change: +54.83 🎉

Comparison is base (2d2be07) 0.00% compared to head (12da3f1) 54.83%.

Additional details and impacted files

@@            Coverage Diff            @@
##           main      #30       +/-   ##
=========================================
+ Coverage      0   54.83%   +54.83%     
=========================================
  Files         0        3        +3     
  Lines         0      124      +124     
  Branches      0       21       +21     
=========================================
+ Hits          0       68       +68     
- Misses        0       49       +49     
- Partials      0        7        +7     

Flag	Coverage Δ
unittests	54.83% <54.47%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/rail/hub/__init__.py	100.00% <ø> (ø)
src/rail/hub/scripts.py	37.34% <37.34%> (ø)
src/rail/hub/options.py	90.00% <90.00%> (ø)

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