Another set of very similar queries to count the number of members in a group

Signed-off-by: emanuele <emanuele45@gmail.com>
Typos

Signed-off-by: emanuele <emanuele45@gmail.com>
created a function to retrieve details of a membergroup from it's id

Signed-off-by: emanuele <emanuele45@gmail.com>
Merge branch 'master' into membersInGroups

Conflicts:
	sources/subs/Membergroups.subs.php
Merge pull request #118 from emanuele45/membersInGroups

Norv should like that.