Code rework to comply (more) with https://www.dokuwiki.org/devel:coding_style
Modified for use of "usermanager_authtype" - behaves more like ggauth's chained.class.php
Minor correction - removed a print_r call
dokuwiki adds "manager.dat", this file should be ignored.
Removed duplicate "this"
fixed "getUserData" for usermanager.
fixed missing parenthesis
Updated author, name, email
Merge pull request #3 from einhirn/master

Make auth plugin behave more like ggauth's chained.class.php