pdfposter: spelling fixes, more diagnostic message on PyPDF2.utils.PdfReadError,
Thanks for creating and maintaining pdfposter.
I noticed some spelling mistakes, so I fixed them.
I got a cryptic error with an old version, so I augmented the error report, but with the current source, the error doesn't hit. So I have not tested this new diagnostic. And I'm not a Python programmer. So beware.pdfposter-spelling.patch