[web] get rid of spurious '[Errno 2] No such file or directory' on load This was caused by can_do_pdf_conversion() which tries to use '/usr/bin/fop'. When fop was not available, an OSError was raised by suprocess.Popen. This changeset first checks for /usr/bin/fop presence, then tries to run fop. If an error occurs, log it instead of printing it. NOTE for later: why do we test explicitly for "/usr/bin/fop" rather than simply "fop" ?

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Add some entities

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As manager, you can access to entity creation forms by using the `site management`_ page.

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.. _`site management`: manage

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As regular user, the index page or the action box may propose some links to create entities according to the context.

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