Remove VersionHandle API from AtomSpace
Remove VersionHandle from AtomTable
Remove VersionHandles from unit tests
Version Handle removal: get tests to pass
Remove the CompositeTruthValue utest
Remove version handles from scheme bindings
remove CompositeTV from file persistance
Remove CompositeTruthValue
Misc cleanup associated with previous commit
Swap DEFAULT_TV and TRIVIAL_TV

The default should be true,in order for ordnary logic to make sense.
The trivial tv is false; that's why its trivial.
Merge pull request #520 from linas/novh

Goodbye to CompositeTruthValue