Convert back to alberta as package name (instead of alberta2). The
version is already recorded in the version number of the shared
libraries, and all libraries have names different from the ones in
release 1.2 anyway.

Move ALL inline viewing stuff to a separate library. I just got fed up
by the library requirements of OpenDX. This also maskes it easier to
separate the core ALBERTA stuff from the graphics business. Also,
external viewers will most likely not need the inline viewers
(e.g. Grape does not need or want gltools, meshtv does not need or
want OpenDX and vice versa and so on).

This also simplifies the "disable graphics" kill switch: the core
libraries simply stay unchanged, it is just that the add-on libraries
alberta_gfx_Xd.[so,la,a] are not compiled.

Demo-package is in accordance with this scheme, and "make distcheck"
succeeded. So it should be ok, in principle.