error_code() function added.
Small registration usability fix.

System version 0.335
modules:
Blogs 0.059
Comments 0.017
Cron 0.008
Feedback 0.005
HybridAuth 2.1.1-cs27
OAuth2 0.020
Photo_gallery 0.012
Plupload 1.5.7-cs10
Static_pages 0.033
plugins:
Admin_default_theme 0.005
Fotorama 4.4.3-cs1
SimpleImage 2.3-cs1
TinyMCE 4.0.6-cs1