This causes an ability to deploy applications that use classes like TransactionStore.

Solution: add  org.h2.mvstore.db to MANIFEST.MF

Modifications to build HTML docs

Update from original

that I commented out in my last commit accidentally

fallout from the IF EXISTS changes

Add support for ALTER [ object ] IF EXISTS

Prevent NPE in IndexCondition.toString() that may arise from debugging

# Conflicts:
#	h2/src/main/org/h2/res/help.csv