Merge pull request #201 from behindthepage/convert-contact-module-variables-to-cmi

Issue #217: Convert contact module variables to cmi.
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.
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Issue #1414368 by coolestdude1, Dave Reid: Drupal_http_request does not handle basic auth correctly when dealing with blank passwords.
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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().
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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.
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Issue #2127835 by zterry95: Fix code format in user.module.