Implemented a way to additionally define groups locally

The configuration file is used in stating a group name and its users in one line separated by '=' sign. The users are separated by commas. These groups are then usable in the ACLs.

example of config file content:

group1 = user1, user2
group2 = user1, user3
Merge branch 'master' of https://github.com/Ahmadlabib2/dokuwiki