[poppler] Solving 8 chars maximum limit on a glyph representation

[Albert Astals Cid]

Like Ross pdf showed, we have a maximum limit of 8 char for the representation 
of a glyph, so even there's a char that identifies itself as \rightarrow 
pdftotext only gives \rightar

I'm fixing this hardcoded limit with the attached patch. As side effects we're 
having a speed boost as i stop copying things when calling 
CharCodeToUnicode::mapToUnicode and lower memory usage as for each 
CharCodeToUnicodeString now only the exact memory needed is used, not a fixed 
8 like before.

I'm attaching the patch for further review. If noone disagrees i'll commit on 
sunday 11.

Albert
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