340b76b4

Reported by formerly Old_Demon on blenderartists.

Apparently this caused old files to lose their links to material sockets
(noob own mistake from inexperience with node system).

This should either be included in release with version checking being
set to version 2.73 and subversion 10, without tweaking the
BKE_blender.h file

OR

340b76b4 should be reverted for this
release.

Thanks to Lukas for checking this out.

Conflicts:
	source/blender/blenkernel/BKE_blender.h
	source/blender/blenloader/intern/versioning_270.c