Increased file descriptor count threshold before warnings appear about leftover PDPipes.
Added space (' ') to glob escaping. Also fixed escape chars 'f' and 'a' entries.
Added PDStringCreateUnescaped, PDStringEscapingCString for handling unescaped input strings. Also fixes issue in PDStringBinaryToEscaped where unicode chars would be mangled due to ch < 0.
Fallback on NULL dict rather than crashing in PDXTableParseTrailer.