In plugin IdPrefixSearch now uses index
Fixed NPE in NavigationSupportImpl
Different PsiReferences for different target types.
(1.Really only MPSPsiClassRef for now)
 2.Some problems remain with constructor renaming )
Handling case when SReference.getSLink returns null
Built plugin in plugin (source changed a little, type system related)
Merge branch 'danya'
Reverted some accidental changes
Fixing NPE in clearFile