some UI improvements and minor fixes


partwin.ccp, partin.h:
  - fixed focus problem
  - disable menubar (we don't want this in a browser plugin...)
  - use own toolbar settings for okularplugin. Changing the toolbar at
    the plugin does no longer change settings for the okular executable!

okularpluginui.rc
  - GUI settings for the okular part
  - predefined toolbar settings suitable for browser plugin

okularplugin_okularui.rc
  - GUI settings for the plugin

CMakeLists.txt
- install .rc files into right directory ($KDE4_DATA_DIR)


README:
  - Build instructions updated: Seperate build from source