- bugfix: report broken for unavailable G2 rewriteApi
- bugfix: detect AJAX/Image callback in gallery_handle_request()
  (also fixes javascript issues on 'plugins' administration)

- bugfix: Wrong images displayed when adding with [G2] tag (#148873)
- bugfix: G2Image gallery path not being set (#148872)
- bugfix: G2Image not adhering to the Default Action setting (#148869)

- feature: detect language prefix of the i18n module for embed_uri

- bugfix: dont trigger report for invalid install

- feature: support for multiple image-/grid-blocks
- feature: new install wizard for initial configuration
- task: status page merged into install wizard
- task: cleanup of status rendering and user settings
- various bugfixes (e.g. batch sync, report, gallery_menu, ...)

Added check for default number of images in filter.

Made exact/max size setting more robust.
Gallery filter now deletes affected caches when defaults change.

Clean up of status page.
Some of the install messages are broken - need to be brought in line with the updated status page.

- feature: added G2 plugin status to status field (on general tab)

Used coder to try to clean up code standard (except for the G2 camelCase of
course). A painful exercise! Hopefully I didn't break anything.

Some typos fixed.
Changed default search thumbnail size to 150.
Changed G2 plugin 'enabled' to 'activated' to be same as G2 nomenclature.

Better usability on Fullname settings.
Added module and plugin checking and display (themed). More work needed here for a general page.

and used the hack in #121306 to do the same for the Gallery2 admin sitebar
(off by default).
- Fixed up the handling of exactsize and maxsize.
- Added form validation for sizes (and sidebar settings).
- (Hopefully) fixed small bug in filter where n param was ignored.