Fixed filtering parameters for VEGAS datasets.

- Added summary message showing number of windows and feeds

- Added scan range to image product filenames

- Improved map finding code by adding Track procedure scans
  to be counted as reference scans

- Added colors to log messages

- Copied mapDefault.py to create_AIPS_images.py and changed
  command line interface to use the argparse library

- Fixed window/feed/polarization filtering parameters for
  VEGAS data