Merge branch 'MDL-43410-26' of git://github.com/andrewnicols/moodle into MOODLE_26_STABLE
Merge branch 'MDL-43250-26' of git://github.com/damyon/moodle into MOODLE_26_STABLE
Merge branch 'MDL-43438-26' of git://github.com/FMCorz/moodle into MOODLE_26_STABLE
Merge branch 'MDL-41246-moodle26' of git://github.com/StudiUM/moodle into MOODLE_26_STABLE
Merge branch 'w52_MDL-43314_m26_floats' of https://github.com/skodak/moodle into MOODLE_26_STABLE
Merge branch 'wip-MDL-41788_M26_3' of git://github.com/gjb2048/moodle into MOODLE_26_STABLE
Merge branch 'install_26_STABLE' of git://git.moodle.org/moodle-install into MOODLE_26_STABLE
weekly release 2.6+
MDL-43482 Chat Lot of "Only variables should be passed by reference".
Automatically generated installer lang files
MDL-43196 do not load file management for guests and when not managing files
MDL-36721 do not store passwords in config logs
MDL-42392 Blocks: Do not hide blocks if JS is disabled

With JS disabled, it is not possible to change the block visibility
user preference and therefore not possible to show content which was
hidden.

Since the block hiding functionality is a nicety, and we have no controls
to show and hide the blocks when JS is disabled, we should instead show the
block content regardless of the user preference.
MDL-42801 JavaScript: Fix dndupload to match actual style
MDL-43508 Quiz Invalid get_string() identifier.
MDL-40379 Files Prevent mobile network providers from modifying content.
Automatically generated installer lang files
MDL-43510 fix 404 unit test server incompatibility
Automatically generated installer lang files
MDL-40119 Forms: Date selector should use images for the calendar popup toggle

The calendar popup toggle must use an image, rather than an input with type
of image as the latter is actually a form of submit button, and hence it
steals the focus away from the real submit button.