opened. More stuff for getting async generator to work. Leakfix.

Note: memory management coolness Vol.1 : now kpdf has memory profiles that
allow using up to xx% of the total memory and clip maximum usable memory to
a half of the free one. Example: an istance of kpdf is using all the
memory (as regular cache). You open some memory hungry app or another kpdf
and you'll see the first istance dropping cached pages (freeing memory!)
to leave room for the other app! It's dynamic, fast, avoids swap and
something cool from my programmer's viewpoint.

svn path=/branches/kpdf_experiments/kdegraphics/kpdf/; revision=373123