Author: Sara Arjona
MDL-58939 portfolio: Remove picasa portfolio
Picasa is discontinued since 2016 so portfolio_picasa has been
removed from core Moodle.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=ba06999e48b1dc021a22aa4dacb8e53b91937aa8
http://github.com/moodle/moodle/commit/ba06999e48b1dc021a22aa4dacb8e53b91937aa8
+ 4.0 en [oauthinfo,portfolio_googledocs]