Added info about editing mediagoblin.ini
Added link to Apache deployment instructions
Noting why we don't have an email uniqueness constraint in the db.

This commit sponsored by Guido Günther.  Thanks!
Merge remote-tracking branch 'refs/remotes/merge-requests/58'
Just word-wrapping the recent changes to the deployment docs.
Added upload processing to the piwigo/addSimple
Changes to display all EXIF information
Modifies EXIF section with Camera Info, display toggle and template styling
Fixed EXIF tests
Take into account incomplete EXIF data
Only calculate aperture if fnumber is provided
A bit of pep8 and small typo fix.
piwigo: Add PwgError class.

This allows to return piwigo xml errors.
Those can also be matched into html error codes.
piwigo: Return proper error for wrong user/password.

And fix tests.
Refactor submit util new_upload_entry

This tool creates an initial media entry for a given user.
No magic. It just prefills the license with the user's
default license and adds the user as uploader.