CVS commit by muesli: 

* Removed all direct sql querying from CoverManager, providing new
CollectionDB methods.

* Minor code cleanup.


  M +2 -2      ChangeLog   1.312
  M +20 -4     src/collectiondb.cpp   1.104
  M +1 -0      src/collectiondb.h   1.51
  M +1 -1      src/contextbrowser.cpp   1.116
  M +1 -1      src/contextbrowser.h   1.22
  M +4 -13     src/covermanager.cpp   1.38