Check for vertical bars in alias detail descriptions

The descriptions of each entry in an alias are stored in config.xml as a list delimited by "||". So you cannot have "||" in the actual description (or the description effectively splits into the next entry). Also you cannot start or end the description with "|" or it will be very confusing having the config with "|||" in it.
This code validates all that sort of invalid input.
Check for vertical bar at start or end of description
Merge pull request #880 from phil-davis/master

Check for vertical bars in alias detail descriptions