libpopt has no pkg-config on hardy, so search it the traditional way
preparations for use of libpopt
Performance: already checked polygons are not checked anymore
missing references in polygon checks produce a warning now
debugging again
fixed bug if hglz contains no starting symbols => endless loop
Added file errors
fixed memory leak if the parser was crashing
fixed bug of zzuf seed 34934 in uncompressed crash.hglz
fixed bug of zzuf seed 34902 (null pointer) in uncompressed crash.hglz
