Merge pull request #625 from adamarla/master

corrections to questions
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Merge pull request #626 from adamarla/master

Space adjustments for some questions
Merge pull request #627 from adamarla/master

- Use gs to generate reasonable resolution preview jpegs from pdf
Merge pull request #628 from adamarla/master

- Altered the resolution for gs again, trying to get a good preview img
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 rewritten to emphasise projections and selections
Merge pull request #629 from abhinavc/master

Rewritten a DB question