Enable comma escaping, unicode chars in classlists

Classlists files as processed by the addcourse script can't deal with users
who, for one reason or another, has a comma in either their first or last
name. Using the Text::CSV module for CSV parsing instead of split() enables
comma escaping values by putting them in double quotes.

Users who have non-ASCII characters in their name gets their name (e.g.:
Frøystein) mangled after going through addcourse. This commit forces Perl
to open the the classlist file with UTF8 encoding. This way the unicode
characters survive intact into the database.
Merge pull request #75 from ionparticle/master

Enable comma escaping, unicode chars in classlists