fix for meinproc, wrong cwd broke together with unsermake

[Stefan Gehn]

Moin,

Just ran accross this. The --check option changed the current working dir but 
didn't revert it afterwards. That broke together with unsermake as the 
current working dir seems to be different than with automake (prolly because 
automake cd's into dirs whereas unsermake avoids that).

I also made transform()  in xslt.cpp a bit less dangerous because it didn't 
check if opening the sourcefile failed. Not sure if returning a QString::null 
is fine for all parts using this function (don't have insight on that).

Bye, Stefan aka mETz
-- 
sgehn_AT_gmx.net | ICQ#51123152 | Moege der Pinguin mit euch sein
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