Make `-h` option outputs version number

[wfarah]

A fast/easy way to check the turboSETI version installed

[texadactyl]

Believe it or not, this issue is not simple. Not impossible but might involve structure changes to the package.

Even though a user can do this with the installed package:
from turbo_seti import __version__ as TS_VERSION

the resident code (E.g. seti_event.py, the main code for turboSETI) cannot because it would creste a circular reference. I've tried.

[wfarah]

Ohh goodie... Not sure if it's a good practice, but can the -h execute the following:

import os
os.system("python -c \"from turbo_seti import __version__ as TS_VERSION; print(TS_VERSION)\"")

[wfarah]

Or even better:

import os,sys
os.system("%s -c \"from turbo_seti import __version__ as TS_VERSION; print(TS_VERSION)\"" %sys.executable)

This way it uses the same executable that turboSETI is using

[wfarah]

@texadactyl. Also, on second thought, it's probably better to make this -v --version flags, rather than making it print the version number with -h --help. This would make it a nicer way to log things, by just calling turboSETI -v at a high level