backend functions implemented on abstract interface
Added implementation of ORA IOVSchema interface
Added schema type resolution at transaction time
Merge branch 'new-conddb-multiplebackends' into new-conddb-dev-copy

Conflicts:
	CondCore/CondDB/src/SessionImpl.cc
	CondCore/CondDB/src/SessionImpl.h
	CondCore/CondDB/test/testConditionDatabase_0.cpp
Integrated existing ORA-based implementation as a back-end for the new condition API
Resolved conflict for the merging - Also fixed missing CondFormats in the migration tools