Issue #189: Porting Admin Menu to Backdrop. Removing Toolbar.
Issue #189: Include top-level tabs as children in admin menu.
Issue #217: Convert contact module variables to cmi
Merging with 1.x
Issue #1820086 by gcassie: Remove mention of drupal_session_count() from inline documentation.
Issue #1683794 by somepal, JacobSanford, Caligan: User action "block user" docblock correction.
Issue #1815886 by bojanz, slashrsm | torgosPizza: Drupal core cannot manage files larger than 4 GB.
Issue #2056363 by yched, Sweetchuck, chx: INSERT INTO table SELECT * FROM ... not supported.
Issue #1679660 by rhm50, amontero, billk2, valthebald | bagvendt: Add link to cron tutorial on drupal.org.
Issue #1414368 by coolestdude1, Dave Reid: Drupal_http_request does not handle basic auth correctly when dealing with blank passwords.
Issue #310315 by superspring, justafish, naxoc, Waltemath | fonant: drupal_wrap_mail() strips trailing blanks from standard hyphen-hyphen-space-newline e-mail signature separator.
Issue #2040209 by WebEvt: CSS is truncated when aggregation is turned on.
Issue #1996644 by apkwilson, abghosh82 | joachim: User_login_name_validate() uses isset() where other user login form validation handlers use !empty().
Issue #2079315 by mondrake: Image style editing leads to redundant watchdog entries.
Issue #2016497 by naxoc, jhodgdon | plachance: Search query extender should not use floats directly.
Issue #1504522 by rahulbile, Chi: Strict warning: Only variables should be passed by reference in update_results_page().
Issue #2078917 by sun: E-mails contain double spaces in soft-wrapped sentences.
Issue #1269166 by mgifford | hass: PRE tags (and other similar tags) have unreadable small font-size in Bartik.
Issue #2127835 by zterry95: Fix code format in user.module.
Issue #2120461 by amitsedaiz | joachim: Theme_status_report() uses an integer instead of a constant.