Added links to Javadoc. Tuned the layout a bit.
Moving Metacat Sphinx RST documentation from docs/dev to docs/user directory.
Updated the Installation chapter, coverted to RST.
Added NCEAS logo to header.
Additional layout and styles for metacat documentation.
Adding new documentation section for Metacat design documents in Sphinx/ReStructured Text format. Build this documentation using theprovided Makefile, assuming that both Sphinx and PlantUML are installed and on the local executable path by running 'make plantuml html'....