CVS commit by hadacek: 

Finally commit the changes to allow the use of a system-wide highscore directory.
The main modificitions are in class KHighscore but the KExtHighscore framework
has also been adapted. The local highscore values are copied to the system-wide
file when first running the game.

Additionnal fixes are:
- fix rounding problems in highscore's statistics tab
- dialog asking for nickname (close bug #55442)


  A            highscore/INSTALL   1.1
  A            highscore/kconfigrawbackend.cpp   1.1
  A            highscore/kconfigrawbackend.h   1.1
  A            highscore/kfilelock.cpp   1.1
  A            highscore/kfilelock.h   1.1
  M +14 -8     configure.in.in   1.3
  M +5 -3      highscore/Makefile.am   1.2
  M +17 -12    highscore/kexthighscore.cpp   1.32
  M +52 -6     highscore/kexthighscore_gui.cpp   1.31
  M +18 -0     highscore/kexthighscore_gui.h   1.22
  M +165 -47   highscore/kexthighscore_internal.cpp   1.23
  M +27 -14    highscore/kexthighscore_internal.h   1.19
  M +1 -1      highscore/kexthighscore_item.cpp   1.21
  M +3 -3      highscore/kexthighscore_item.h   1.17
  M +4 -4      highscore/kexthighscore_tab.cpp   1.11
  M +1 -1      highscore/kexthighscore_tab.h   1.7
  M +128 -34   highscore/khighscore.cpp   1.16
  M +94 -15    highscore/khighscore.h   1.8