Make renderer work on opaque images without 100% CPU usage.- Remove Qt3 copyBlt() & bitBlt() calls which are badly emulated by Qt4 (either incorrect behaviour or very slow due to QPixmap -> QImage -> QPixmap translation)
- QPainter::drawRect() -> fillRect() to not be off by one
- Remove unused kpPixmapFX::getNonNullMaskAt(),setMaskAt()[2x],ensureOpaqueAt(). At last check, one of these was wrong anyway (untested code).It _might_ be possible to use KolourPaint4 now depending on ones' interpretation of "working".