Issue #1190452 by Boobaa, coleman.sean.c, Jose Reyero: Implement 'validate callback' for some variables / variable types.

Issue #1559674: Fixed String type variables being wrapped with <pre></pre> tags when displayed with tokens. Improved 'string' and 'text' format will 'allowed tags'

Issue #1594656 by etrometer, Jose Reyero: Htmlspecialchars() expects parameter 1 to be string. Added 'properties' variable type. Better format.

Issue #1585946 by bforchhammer, Jose Reyero: Fixed language_default() form element ignores existing value.

Issue #1593398 by bforchhammer, Jose Reyero: Fixed Variable realm selector value lost after form submission.

Fixed variables passing to form altering functions, need to pass children variables instead of top level ones.

Minor improvements, clean up variable_store, better reset, static caching and removing variable_store_variable_delete.

Issue #1567232 by Jose Reyero: API improvements for Variable Realm. Simplified realm hooks, now everything is in hook_variable_realm_info

Issue #1567232 by Jose Reyero: API improvements for Variable Realm. Partial rework using more classes.

Added metadata about variable_realm_weight_ variable. Do not show empty groups in variable admin page.

Issue #1567232 by Jose Reyero: API improvements for Variable Realm. Added some more options and hook_variable_realm_params_alter().

Issue #1567232 by Jose Reyero: API improvements for Variable Realm. Added hook_variable_realm_info_alter()

Issue #1567232 by Jose Reyero: API improvements for Variable Realm. Added 'keys callback' and 'list callback' support in variable_realm_info(). Resolve variable conflicts in settings forms using weights.

Issue #1567232 by Jose Reyero: API improvements for Variable Realm. Order realms by weight in variable_realm_list()

Issue #1567232: API improvements for Variable Realm: removed drupal_strtolower call on t() parameter.

Issue #1567232 by Jose Reyero: API improvements for Variable Realm. Added hook_variable_realm_variable_list_alter()

Issue #1567232 by Jose Reyero: API improvements for Variable Realm. Auto generated settings forms for variable realms.

Issue #1567232 by Jose Reyero: API improvements for Variable Realm. Improved per realm/key settings forms.

Issue #1567232 by Jose Reyero: API improvements for Variable Realm. Introducing hook_variable_settings_form_alter()

Issue #1567232 by Jose Reyero: API improvements for Variable Realm. Moving hook_variable_realm_switch() to realm module.