Fix for compiling on Qt5 (Linux)

Changed as per:
https://qt-project.org/doc/qt-5.0/qtwidgets/qheaderview-compat.html
Progressbar color fix

Commented out old inline style code since it's now in an external
stylesheet.  Fixed a color bug for the progressbar.
Merge pull request #1 from necom/master

Progressbar color fix