handle (Java) date/time/timestamp unexpected nulls as ""
minor - mostly doc related updates
cleanup ArJdbc::Derby module's Java part
rename MissingFunctionalityHelper -> TableCopier
hide ArJdbc::Jdbc module from doc
we shall (no longer pend) start testing usec precision for timestamp values
[postgres] timestamp with usec precision fix
mysql does not support usec precision - thus undef test
some more (DerbyModule.java) quoting  cleanup/sharing
spec should extend instance before connection is instantiated
(for spec module's #init_connection to work correctly)
a little experiment - removing #init_connection once checked driver info
[postgres] usec quoting should only happen since AR-3.0
only setup usec precision quote_date on SQLite3 while on AR >= 3.0
fix mysql usec related test since it does not handle precision beyond sec
[derby] timestamp usec precision support
[hsqldb][h2] usec precision quoting for Time values
[oracle] Time precision beyond seconds support + some doc review
some more oracle magic for TIMESTAMP handling - tests seem to like it ...
use our extended save-point API with Oracle + tune-out tests
rebuild jar