Updated parameters for 3 CASA guides. (URLs changed with CASA 4.0 release.)
Explicitly start CASA v4.0.0.

For some unknown reason, the multivac nodes began starting casa 3.4.0 when
casapy was invoked.  This was corrected the following day, but it doesn't
hurt to explicitly start the version I want.

On the down side, this version will have to be updated with the next CASA
release.  I'm leaving it in for now...
Created functional breakdown of procedure for turning tasks off.

I created a general purpose function that turns off (comments out) a task.
I also created a fuction that turns off all diagnostic plotting tasks.  Added
command line parameters for turning off all diagnostic plots.

A function to turn off au.Plotbandpass needs more testing!  It's written, but
not used for now.
Commented out commands to look for data on anteres and arkleseizure.
Renamed bash script with .sh extension.
Adding .gitignore to ignore compiled python files.