CARROT-978: update (c) clauses on source files.

Conflicts:
	workbench/org.carrot2.workbench.core/src/org/carrot2/workbench/core/ui/BrowserFacade.java
	workbench/org.carrot2.workbench.core/src/org/carrot2/workbench/core/ui/actions/ReprocessFlushCachesActionDelegate.java
	workbench/org.carrot2.workbench.vis.carrotsearch/src/org/carrot2/workbench/vis/ProcessingResultMirror.java
CARROT-978: update (c) clauses on source files.