added utility font

participants-database.php
changed plugin list text to use new glyph
updated credit panel to use glyph

PDb_FormValidation class
fixed captcha validation to use WP_Session

PDb_Session class
added clear method

PDb_Signup class
captcha session vars are cleared on successful submission

git-svn-id: https://plugins.svn.wordpress.org/participants-database/trunk@822968 b8457f37-d9ea-0310-8a92-e5e31aec5664
updated to Norwegian translation files

manage_fields.php
changed tabs to show group titles, not names to support translated titles.

participants-database.php
added $default_options property and corresponding WP option so that default options can be gotten without querying the database.
session_start() is no longer called

PDb_Init class
default group titles now translated

git-svn-id: https://plugins.svn.wordpress.org/participants-database/trunk@823395 b8457f37-d9ea-0310-8a92-e5e31aec5664
updated POT file

git-svn-id: https://plugins.svn.wordpress.org/participants-database/trunk@823402 b8457f37-d9ea-0310-8a92-e5e31aec5664
updates to admin CSS

git-svn-id: https://plugins.svn.wordpress.org/participants-database/trunk@823740 b8457f37-d9ea-0310-8a92-e5e31aec5664