A new user type added - job agency.

In difference from the existing employer users, the job agencies can post jobs for other companies - their forms for posting jobs in the employer administration panel contain also fields allowing to enter the company information, company logo and others (instead of taking this information directly from the profile like for the regular employer users).
On the registration form when signing up, the users have the option to select if they are an employer or job agency and their account will be created accordingly.