OMERO properties rework for simplification and central administration

[jamoore]

This ticket subsumes:

• #437 - Remove local.properties.default
• #556 - Ability to store omero.data.dir in local.properties rather than omero.properties
• #660 - Copying local.properties into the ear file
• #718 - Preferences based configuration
• #734 - Location for LDAP read/write values
• #741 - proper defaults
• #746 - sensible javac|javadoc.maxmem values
• #753 - central administration
• #754 - A writable configuration store for ldap

And will also include the merging of ice.config & glacier2.config with omero.properties (with overrides in local.properties).

Other possibilities:

• Allow comma separated values in OMERO_CONFIG for prefs.class
• Allow a path value in OMERO_CONFIG for prefs.class
• Failover to using $HOME/.omero.config when Java not present from Python
• Warn when Java preferences or .omero.config are not umask 077
• Use IConfig as the central configurator which is injected into beans. This would allow hot-swapping properties
• Outline all environment properties which are of importance for OmeroBuild, OmeroBlitz, OmeroGrid, etc. (ICE_CONFIG in grid?, OMERO_CONFIG, OMERO_MASTER, OMERO_NODE, ..., NOMAKE, ...)

[jmoore]

Added #718

[jmoore]

prefs class available with:

• r1951
• r1952

[jmoore]

Am now adding a configuration table for persistent properties. OmeroSearch is the first requirement, needing to keep up with the id of the current EventLog to search.

[jmoore]

Though pieces of this are done, it won't be ready for Beta3. Pushing.