CRLF&LF mixed in some files. Cleanup.

Almost *.py was LF line terminators. But, those files CRLF&LF mixed
  BetOnlineToFpdb.py: CRLF & LF mixed
  BovadaToFpdb.py: CRLF & LF mixed
  PokerTrackerSummary.py: CRLF & LF mixed

Those files are CRLF.
  Archive.py: CRLF only
  BovadaSummary.py: CRLF only
  EnetToFpdb.py: CRLF only
  GuiHandViewer.py: CRLF only
  MergeStructures.py: CRLF only
  PokerStarsStructures.py: CRLF only
  PokerTrackerToFpdb.py: CRLF only

This branch fixes:
  Unify LF line terminators for *.py.
  Delete trailing whitespaces.
  Use 'utf-8' instead of UTF-8 for coding magic comment in Archive.py.

Maybe, "git diff --ignore-space-change" is useful for confirm changes.