Added element position argument to DCfgMgrBase::createConfigParser(),
so derivations have access to print position info unsupported top level
element errors.

Removed two log messages DCT_ORDER_ERROR and DCT_ORDER_NO_ELEMENT. These
conditions are well explained in exceptions thrown and these logs just
cluttered the log output.

Removed extra text from DCTL_CONFIG_LOAD_FAIL and DCTL_PARSER_FAIL log
messages. The log ID is self-explanatory and the underlying exceptions
provide ample explanation of the error.  Makes the log output much easier
to understand.

Revised items-not-in-parse-order detection in DCfgMgrBase::parseConfig().
Rather than complicated counting logic, objects are removed from the list
as they are parsed.  Any left over were not in the parsing-order.

Removed try-catch-throw from DCfgMgrBase::buildAndCommit. This method
already throws its own exception. Catching, logging, and re-throwing
exceptions from underneath it really just server to clutter the log.