Occurences of $ character in environment variables are interpreted as bash variables

[Astor-Bizard]

Having an occurence of $ in a string sent as an environment variable (for example in MOODLE_GROUP_NAME) doesn't work as it will be expanded as a variable.
Example: group name is "My $group with my friends"
What is written in vpl_environment.sh: export MOODLE_GROUP_NAME="My $group with my friends"
What is the resulting $MOODLE_GROUP_NAME: My with my friends
This is discussed in #214 .