Compare the files split via equals to the exact length of the splitter.
This is a fix of issue #47476.

specification version number increased

The items in Versoining menu are back as menu presenters.
VersioningExplorerAction has still an empty icon.
This is basicaly a rollback of issue #46398.

Speed up cache populating.

The dependency on the protected list field has been removed,
the field is made private again.

Locally modified files that are needed after new vcscore impl.

The list made protected again so that the sources compile.
There's a dependency in cvs visualizers.

HTML annotation added, also FolderNode is annotated.
The icon is annotated in every case.

Add the versioning opener listener when an action is performed.
This is a fix of issue #46249.

Versioning explorer implementation simplified
=============================================

Shadow VersioningFS removed because it needlessly duplicated
all FileObjects and required complicated synchronization
logic between VcsFS and VersioningFS.

- Versioning feature (rev lists and inputStreams) delegates to VcsFS
- versioning settings are stored at VcsFS root file attributes

Versioning explorer reimplemented dropping DataSyatems
layer. The extra DataSystems layer required the extra VersioningFS
that provided unique FileObjects distinct from those provided
by VcsFS. This was necessary to keep 1:1 FileObject:DataObject.primaryFile
invariant. New UI (nodes) works direcly over original VcsFS FileObjects.