Preserve original exception in CreateTable and AlterTableAddConstraint.

TableLink: column names are always case insensitive for MySQL

make beforeWrite() to call commit() instead of tryCommit() in case of unsaved memory churn

Address code review comments.

TransactionMap::sizeAsLong() optimized - temp map eliminated

1177 recover leak

Improve concurrency of connection pool with wait-free implement

Improve naming of the object id field in Prepared

Do not change ID of existing constraints in AlterTableAddConstraint

Drop TransactionMap.readLogId

Improve CURRENT_TIMESTAMP and add LOCALTIME and LOCALTIMESTAMP

Improve precision of CURRENT_TIMESTAMP on Java 9+ and change its return type to required by standard

Magic value replacement with constant

Introduce last commited value into a VersionedValue

tighten test conditions - do not ignore any exceptions