Proper way of renaming from "kolourpaint" to "kolourpaint4": change internal KAboutData name.

This reverts the "KolourPaint4" config group prefixing of the previous commit and we no longer insanely share config files between KDE3 and KDE4.

Changing the internal name to "kolourpaint4" meant that we also had to:

1. Rename the install directories to "kolourpaint4" (including docs)

2. Rename the app icons to "kolourpaint4"

3. Call KAboutData::setProductName() with the bugs.kde.org product name of "kolourpaint" (no '4')

Other changes:

* Various source files no longer have to explicity point to "kolourpaint4ui.rc"

Other changes that seemed to have no effect:

* Change kdegraphics/kolourpaint/CMakeLists.txt's "project" to "kolourpaint4"

* Rename "name" attribute of "gui" tag of kolourpaint4ui.rc to "kolourpaint4"