Review all links to omero.properties

Only keep links to omero.properties for the build system or variables not parsed into the glossary, e.g. omero.upgrade.urls)
Do not use omero.properties as the default source extlink
Review all references to configuration properties

Use :term: markup when possible
Use a term markup for omero.checksum.provided
Fix double dot in LDAP page
Add link to omero.checksum.supported in FS page and remove duplicate list
Rename memory-configuration
Change jmvcfg.SERV.x to jvmcfg.x.SERV
Add jvm_metrics section and fix TODO ref
Fix TODO search ref
Add common Java-related abbreviations
Add initial monitoring/metrics draft
Remove markup from :alt: sections
Link metrics from whatsnew
Convert useful metrics list to glossary
Link from perf-jmx to jmx-config
Link to memory settings from whatsnew
Remove erroneous copy and paste
Fix indentation and closing literal markup
Add omero fs section to sysadmin docs.