Collective.documentviewer

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- make sure to close open file descriptors

- Change "Original Document (PDF)" to "Original Document"

- emit event after conversion

- only show queue link if manager

- convert button should work for files that do not have
layout selected yet

- use communicate instead of wait with popen in case
output is large. Prevents deadlocks.

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- do not assume pdfpal is used along with pageturner
on data conversion.

- better command runner

- track errors better and display them in interface if something
happened during conversion

- new file storage structure to prevent too many files from
being in one directory

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- fix full screen button when text or pages selected.

- be able to customize batch size

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- make sure to not use files with spaces

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- be able to detect if pdf already has text in it
and do not OCR it if it does.

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- use jQuery instead of $()