Optimized look of compare view of changesets.
Added cut off limit for compare view

Enabled compare engine for tags
Implemented compare engine for git repositories

implements #649 added two seperate method for author and commiter to VCS changeset class
- switch author for git backed to be the real author not commiter

implements #636, lazy loading of history and authors to speed up page responsiveness.
- loading full history is not always needed, and it's very heavy operation. Now this is lazy loaded
when clicking on button

fixes #645 Fix git handler when doing delete remote branch
- journal will now display nicer labels for create tag, and delete branch operations for git

new patch function, and urls schema.
now rhodecode generates
- diff
- plain diff
- patch files

both for git and hg

Implemented generation of changesets based
on whole diff instead of per file diff. That
can give a big speed improvement for large changesets in
repositories with large history.
- improved handling of binary files
- show renames of binary files
- implemented new diff limit functionality
- unify diff generation between hg and git
- Added binary indicators for changed files,
- added diff lib tests

small anchor cleanup
- fixed readme positioning with fixed bar
- added anchor link to inline comment

fix for issue #602, enforce str when setting mercurial UI object. When this is used together with mercurial internal translation system
it can lead to UnicodeDecodeErrors

Let the function calculating changeset history do all the work
- fixed exception handling for fallback method

implements #632,
- added branch/tag/bookmarks info into feeds
- added changeset link to body of message

- add loading message on lazy loaded toolips for journals
- fixed callbacks on admin journal

Fixed issue when node didn't exists at 'tip' and we tried calculate history based on that assumption.
Now fallback to the changeset the node exists in for history calculation

fixes #625 Git-Tags are not displayed in Shortlog
- improved git extraction of git tags if they are associated to a commit
- added not implemented tags() function for git changesets

new tooltip implementation
- added lazy loading of changeset tooltips for journal data

Implemented #628: Pass server URL to rc-extensions hooks
- updated rc-ext docs

fixes #630 git statistics do too much work making them slow.
added/changed/removed methods didn't use generator methods to return the list of changes
- added test for that case

fixes #612 Double quotes to Single quotes result in 4; to 9; in a visual Diff. Markupsafe.escape method usage
was causing some unpredictable behavior

deleting a group now does same archive operation like deleting repositories. Improve prompt that show number of repos that will
be archived together with a group.

don't check for url issue links, since we always want to linkify changeset into a repo link, fixes issue
with issue_pat beeing disabled breaks the urlification

Update last_change from VCS data on request.
- lightweight dashboard shows now last_date also taken from db and it is fast !

fixed issue with show at revision button. Some JS were not properly loaded due to ajaxified files view.
Removed JS code and the logic for that is in python view now. Simpler and less ugly JS callbacks

smarter calculation of showed associated changeset in file source view
- before rhodecode showed TIP changeset when initially displaing file source as description of associated commit
this can be misleading. Now smart calculate last commit of a file, and show specific commits when switching from history view

Calculate file history always from latest changeset to always show full history.
When doing the calculation from a particular changeset git doesn't any records from parent changesets

Don't allow cherry picking changesets from the changelog using checkboxes.
Change pull request text that will indicate opening pull request against checkec changesets