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Make the project files list sortable (#997).

Fix repository browsing at given revision for various scm and add tests for this.

Inline images alt attribute set to the attachment description.

Fixed: inline image not displayed when including a wiki page (closes #1001).

Various timelog report enhancements:
* report can be done using days as columns (#993)
* add a total column to the time report
* replace upper-right links by tabs to switch between details and report
* preserve date range filter when switching between details and report

Fixed: single file 'View difference' links do not work because of duplicate slashes in url.

Verify rev and rev_to params format in RepositoriesController. And turn revision arguments into integers in SubversionAdapter.

Display the context menu above and/or to the left of the click if needed (patch by Mike Duchene, closes #960).

Fixed: trying to preview a new issue raises an exception with postgresql (close #984).

Attachment model clean up: fixed some inconsistent indentation and an inaccurate comment (closes patch #903 by Rocco Stanzione).