change the PageStore#changeCount field from an int to a long, to cope with databases with very high transaction rates.

Issue 481: Further extensions to PgServer to support better support PG JDBC, patch from Andrew Franklin.

Issue 477: PgServer binary transmission of query params is unimplemented, patch from Andrew Franklin

Improve error message when we have a unique constraint violation, displays the offending key in the error message

Issue 474: H2 Mysql Compatibility code fails to ignore "COMMENT" in CREATE TABLE, patch from Aaron Azeckoski

Add "-list" command line option to Shell tool so that result-list-mode can be triggered when reading from a file

Referential integrity: when adding a referential integrity constraint failed, and if creating the constraint automatically created an index, this index was not removed.