Fix MVTempResult implementations for results with invisible columns

Another fix for #1265 : preload DBException

Read nanoseconds of timestamps from old H2 versions properly and remove some dead code

Clean up interaction between LocalResult and ResultExternal

Allow parentheses around final action in WITH

Assorted changes in Parser

Improve support of ARRAY and SQLXML in JDBC layer

Do not quote other lower case characters

Use token type in Parser instead of string comparisons

Minor memory leak