Issue Tracker 1.6.0

This contains two new features which are a restructured Progress History and the ability for a site administrator to create Custom Fields for capturing additional information upon raised issues.

+ Add ability to have custom fields for issues.

~ Change progress recording such that progress information is stored in its own table.

~ Change code to allow for changes in Joomla 3.2 API relating to redirection.

~ Review usage of strings in admin side of the site.

~ Remove restriction on only permitting one file to be attached in the front end.

+ Include the attachments present on an issue in the front end edit form, if attachments are enabled.

~ Only display Issue Resolution in front end if there is a resolution to display. i.e. Open issues will not display resolution details.

+ Add ability for an attachment to have a user provided title.

+ Add encoding for Cron submitted email for subject header.

+ Numerous minor fixes and changes.