Refresh scripts/TakeSnapshot.py

[anthonyfok]

It was suggested during internal demo/review that script/TakeSnapshot.py would benefit from the use of Python 3 argparse for parsing command-line arguments, see https://docs.python.org/3/library/argparse.html

[anthonyfok]

And maybe try to deduce the arguments from existing files in the current directory so that instead of

../scripts/TakeSnapshot.py ACM4p9_GeorgiaStraitFault b 1 2 3 4 5
../scripts/TakeSnapshot.py ACM7p4_DenaliFault b 181 182 183 184 185
../scripts/TakeSnapshot.py SCM5p5_ConstanceBay b 118 119 120 121 122

we could instead simply run:

../scripts/TakeSnapshot.py ACM4p9_GeorgiaStraitFault
../scripts/TakeSnapshot.py ACM7p4_DenaliFault
../scripts/TakeSnapshot.py SCM5p5_ConstanceBay

But, if there are ambiguities, stop and ask the user to enter all 7 arguments.

[anthonyfok]

And maybe try to deduce the arguments from existing files in the current directory so that instead of

Instead of modifying the Python script, I decided to write a quick-and-dirty bash script scripts/run-TakeSnapshot.sh to do the same.

[anthonyfok]

Might like to fix this warning while we are at it:

../scripts/TakeSnapshot.py:293: FutureWarning: The frame.append method is deprecated and will be removed from pandas in a future version. Use pandas.concat instead.