Girocco/Project.pm: add get_full_list_extended function
The existing get_full_list function returns the list of
project names by reading the group file directly.
Add a new get_full_list_extended function that does the same
thing but returns an array of array refs consisting of all
the individual fields rather than just the names.
Tighten up the check a bit to only return items with a gid
>= 10000 rather than just 5 or more digits.
Add some comments explaining the return value for the functions.
Signed-off-by: Kyle J. McKay <mackyle@gmail.com>