fix for meinproc, wrong cwd broke together with unsermake

[Stephan Kulow]

On Saturday 19 July 2003 15:14, Stefan Gehn wrote:
> 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).
> 
Looks ok, even though I would fix docs.um too

Greetings, Stephan