Fix bug where input values to PostScript functions were not clamped.
Fix bug where input values to PostScript functions were not clamped.

Ignore-this: b4a3b9847ddbbcf11b94d087c8c5a928

darcs-hash:20100605155751-86a4e-0a3f03a3ec269482e6f8c484e4588eb4170539b7.gz

nqv/mupdf,nqv/mupdf,nqv/mupdf,nqv/mupdf,nqv/mupdf,nqv/mupdf