#642 - Setting all null-checks to use is_null()
Merge pull request #26 from oldskool/fluxbb-1.4

Fluxbb 1.4
#642 - Replaced all "custom" null-checks with is_null() checks.
Merge pull request #27 from oldskool/fluxbb-1.4

#642 - Replaced all "custom" null-checks with is_null() checks.
#640 - Renaming banned users will now keep them banned.
Merge pull request #28 from oldskool/fluxbb-1.4

Fluxbb 1.4
Forgotten file of #642
Merge pull request #29 from oldskool/fluxbb-1.4

Fluxbb 1.4
Fixing faulty ban-update check of #640
Merge pull request #30 from oldskool/fluxbb-1.4

Fluxbb 1.4
#647: Add database fields for promoting users in user groups.
#647: Add admin management of promoting users to new groups.
Do not allow user group promotion for and to admins.

Related to #647.
Don't promote users to a group if that group is being deleted.

Related to #647.
#647: Promote user to new group after posting, if enabled.
#648: Completely remove ranks feature.
#646: Add database field for per-group setting to post links.
#646: Add admin management for per-group setting for allowing links in posts/signatures.
Fix tab order and list of selectable promotion target groups when editing user groups.

Related to #647.
#646: Make setting for posting links visible in help area underneath textareas.