...to get the deadlock under control the fix for which had to be reverted with
22fbbfe9 "Revert 'Avoid deadlock when two
threads call into Frame::close'".

Generally, replaced instances of TransactionGuard(E_HARDEXCEPTIONS) with
checkDisposed() and instances of TransactionGuard(E_SOFTEXCEPTIONS) with
nothing.  A TransactionGuard would not establish a locked section per se (only
would it engage in locking when TransactionManager::setWorkingMode is called,
see the deadlock mentioned above), so the potential for introducing new races
should be manageable.

While at it, get rid of those implcp_* "debug methods" used to SAL_WARN about
bad arguments to some UNO interface method implementations.

Change-Id: I5ea9c1c8b20fd38457c558dbcb3a853a51a09b6e