Memory leaks

[Mike Nordell]

There are quite a few strings allocated by UT_strdup in the piecetable
(allocation chain goes something like
frame->document->piecetable->varset->PP_AttrProp::setProperty->UT_strdup.
Oh, *and* UT_cloneString from PP_AttrProp::setAttribute.

Perhaps it could be consedered a nice gesture to free that memory? :-)

/Mike