[poppler] Get/Set PDF ID

[srinivas adicherla]

Hi,

    First of all thank you all for giving me suggestions & comments. I made
changes to the previous patch and attached the new patch for getting/setting
PDF ID.
I attached the patch without having the API Documentation. I will do it as
early as possible. I think I made indentation correctly this time. Mean
while, send me suggestions/comments about this patch.
If possible tell me how to add API documentation.

@Carlos Garcia : I also thought that PDFDoc::SaveAS() will set the ID in the
document. But that is not always.

In PDFDoc::saveAs(GooString *filename,PDFWriteMode mode). We have to pass
the mode as writeForceRewrite then only it generates the ID and set it. But
I tried with some PDF files, It is setting the ID in the trailer dictionary,
but it is loosing the data. I don't know why it is happening. If you want
you can check I attached that PDF (bigtable-osdi06.pdf) file also. It has
happened for all pdf files I have checked so far.

Thanks
--
A srinivas
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