Metacat

Moving Metacat Sphinx RST documentation from docs/dev to docs/user directory.

Merged most recent changes from trunk into the RST converted version of the Administrator's Guide. Now the Sphinx/RST version is up to date rlative to the most recent word document, and is now the active copy. The MS Word document will be deprecated and removed. All future changes should be made to the RST version.

Removing unused screenshots that are duplicates of the others in the admin doc.

Screenshots from the Metacat admin guide.

Adding new documentation section for Metacat design documents in Sphinx/ReStructured Text format. Build this documentation using the
provided Makefile, assuming that both Sphinx and PlantUML are installed and on the local executable path by running 'make plantuml html'....