Ensure that trigger runs with "try" variants and still has access to the transaction.

git-svn-id: https://carbonado.svn.sourceforge.net/svnroot/carbonado/trunk@1411 10d2b956-6817-0410-83da-9bc979dc7b36
Favor Tupl in-memory repository for reconstructed cache.

git-svn-id: https://carbonado.svn.sourceforge.net/svnroot/carbonado/trunk@1412 10d2b956-6817-0410-83da-9bc979dc7b36
Some repositories don't properly support top-level transactions, so retry if the isolation level switches incompatibly.

git-svn-id: https://carbonado.svn.sourceforge.net/svnroot/carbonado/trunk@1415 10d2b956-6817-0410-83da-9bc979dc7b36