Remove horizontal rule/paste text buttons
Improve link color for red alerts

The light blue on pink was quite harsh on the eyes.
Remove custom color for board closed notice
Improve dismiss PM notice
Remove unneeded <br> tags
Fixes #187 "Update Attachment" button shows regardless of attachments
Update postbit_attachments language string
Remove pms_in_folder language variable

When viewing a PM folder, you're greeted with the message "Private Messages in folder Inbox". It's no harder to understand what folder you're in if you're displayed with the folder name alone.
Add "Show Private Message IP Addresses" setting
Don't show iplogged bit if PM doesn't have an IP address