Metacat

add note to enable ssl mod

-include instructions about enabling AJP connector in Tomcat config
-use postgres 8.4
-include hint to disable default Apache site (otherwise the knb config never gets used!)

include instructions for installing Sun's Java6 JDK since it is no longer in apt-get repos

make it clear that the Apache config files are samples and may need to be modified for different servers
http://bugzilla.ecoinformatics.org/show_bug.cgi?id=5516

update system requirements to be more reasonable

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

Removing obsoleted Admin Guide -- this guide is now maintained using Sphinx in docs/user/metacat -- the word document and PDF file are now obsolete.

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.