Pyface 7.0.1

This is a bugfix release which fixes a number of minor issues with the 7.0.0
release.

Thanks to:
Aaron Ayres, Kit Choi, Rahul Poruri, Pedro Rivotti, Corran Webster.

Fixes

• Fix copyright header in AboutDialog. (#573)
• Fix dock pane layout on Qt5. (#545)
• Fix errors from incorrect QImage memory management. (#546)
• Fix CodeWidget handling of parsed tokens which caused TraitsUI CodeEditor to
  fail when a different lexer was chosen (#566).