Mostly just made some files PEP8 compliant. Added an option to Messenger to
write lines to a logfile as well as to the screen.
Added a debug function to the Messenger class so that debug messeges can be printed or excluded more easily.
Logfile can now be changed outside of init for Messenger class via an accessor.
Fixed bug in circular feed stokes Spart operators concerning imaginary number. File is now PEP8 compliant.
Fixed a bug in the read_data_from_ms function regarding flagging circularly polarized correlations. CAUTION: This current version overrides the data column keyword and manually selects the corrected_data column. There is some kind of bug in selecting data columns other than the default that I haven't understood yet. This override is a temporary workaround.
Removed data column override in the read_data_from_ms function. All is working fine.
Added some comment text. Made some code PEP8 compliant. Updated README.md to include some newer features.
Merge branch 'develop'