Merge pull request #2308 from Oldiesmann/release-2.1

! Define $context['board_notification_mode'] for guests to prevent error...
Merge pull request #2309 from Oldiesmann/release-2.1

! Make sure variables are defined before using them (fixes #2301)
Merge pull request #2310 from Oldiesmann/release-2.1

! updatePreview was defined in two places and one instance was wrong (fi...
Merge pull request #2312 from Oldiesmann/release-2.1

! Improve handling of login history (fixes #2290)
! Icon position fix
! Small css tweaks (index/admin)
! Bug-fix for bug found in 2.0.x (ManagePermissions.template.php)

fixes #2313

Signed-off-by: Antes <antes@simplemachines.org>
Merge pull request #2315 from Antes/theme_fix

! Icon position fix
Icon fix leftover
Signed-off-by: Antes <antes@simplemachines.org>
Merge pull request #2320 from Antes/theme_fix

Icon fix leftover
Merge branch 'release-2.1' of https://github.com/SimpleMachines/SMF2.1 into release-2.1