User Mnet Hosts block

The User Mnet Hosts bloc is similar to the Mnet Hosts block except it provides a mean to control which subset of mnet_hosts are offered as outdoors to the user.

The block provides its own tools to install significant user custom fields and custom field catagory in Moodle so the MNET output can be controlled.

At its stage of developement, hiding a MNET in list of possible destination should not be considered as sufficiant in terms of security. These are not security doors, but a way to provide intelligible navigation to users depending on there profile.

A further securisation of the door is in developement plans.