Metacat

update system requirements to be more reasonable

Fixed formatting to make fixed-width line much shorter so boxes fit on the page.

Removed link to obsolete PDF file.

Modifications to make the build more readily find locally installed versions of
sphinx-build, and to remove the unneccary 'html' directory; output of
admindoc is now written directly into build/docs.

Added links to Javadoc. Tuned the layout a bit.

Completed first draft of Admin guide chapter on DataONE.

Continued authoring the description of DataONE in Metacat. More to come.

Initial outline for DataONE chapter.

Added OAI-PMH chapter that was contributed by Duane Costa from LTER.

Fixed formatting.