For #458

The guidelines on how to write your own module talk about the process() method receiving a “$request” or a “$state” parameter, instead of being consistent and sticking to just one of the names. Use “$request”.

Deprecate AttributeRealm authproc filter

That should be done in the release branches themselves, and the release number in the spec file updated as part of the release process.

No functional changes.

For: #458

`core:ScopeFromAttribute` is a generalised version of this.

Closes: #512

RPM specfile cleanup

Add missing translations for “required” and “optional” strings when checking PHP extensions installed.

Fixed Language Tag Paramerters

Add missing definition for FLUSH-command

Note the tags 'spname' and spdescription' that cannot be namespaced because
their translations are loaded dynamically.

For #455 and #465

For: #458

For #454 and #465

bugfix: $langPath won't be defined if an exception is thrown by the method where we get its value from.

For #455

Also add some docs.

Fix required attributes duplication

While parsing the XML metadata file of SP, attributes in AttributeConsumerService marked as required where added multiple time causing duplication of attribute keys in attributes.required section.