Reorganize and comment installed, default property files

Includes #939.

Removes license headers from config files. Not all of them had it anyway, plus the FDB ones don't.

Slightly different selection of commented properties in the default file (packaging/conf/server.properties). Notable addition is pipelining, which will be turned on for FDB. Suggestions for others to include welcome.

Cull out unreferenced properties from default, rename exec_time_threshold to exec_threshold_ms and rename fdbsql.datapath to persistit.datapath.

Remove MySQL compat options from default and change collation behavior from LOOSE to STRICT. Necessitated adding a collation name for UCS_BINARY as type attribute picking wants to use AkBinaryCollator.name. Could use a name that already exists (e.g. utf8_bin) but a number of expected files would change.