Remove last use of Reflex::CollFuncTable

This pull request fixes the cause of the exception that currently causes all ROOT6 relvals to fail.  This request replaces the last use of Reflex::CollFuncTable with the ROOT class TVirtualCollectionProxy.

It is not yet known whether the relvals will now pass, or fail on a later error.

NOTE:  The changes to StlContainerHandler.* are much less extensive than they appear here.  This is because the files were also converted from DOS to UNIX format by removing the trailing carriage returns.  Using the "-b" flag with git diff will show the actual changes.

Please merge this before the next ROOT6 IB unless there are obvious problems.