[XFA] Forum Sales - XF2 3.1.1

Corrected bugs:

• Broken forum view layout when grid view is active
• Manage sale by anyone permission not working

Corrected bugs:

• When forces sale is selected in a forum and user doesn't create a sale, error message is not displaying.
• When forces sale is selected in a forum, create sale is not extended and the checkbox is not checked by default.

Corrected bugs:

• "Please enter a valid email" error when managing a sale when in centralized mode.
• "Ouf of stock" spelling error.

Corrected bug:

• Grid view not displaying

New features:

• Your sales page on front-end
• Your purchases page on front-end
• New sales payment mode : Centralized (as opposed to individual)

Sales payment can be configured in two modes:

• Individual: Users get paid directly either by PayPal or external means (eg. money, check, ..., if you authorize it as you wouldn't be able to get percentage on sales).
• Centralized: You get paid by PayPal for every sale of users items and you then manually transfer the money back to the seller. The buyer has the mean to confirm the effective reception of the item thus allowing you to only give money back for guaranteed sales

Thanks to @Trueprime for funding the new mode.

Corrected bugs:

• All PayPal payments result in error when percentage on sale is set
• Unable to Navigate to 2nd page of server error logs

Corrected bugs:

• Create sale fields not displaying in thread page when user has not the right to create a poll

Corrected bugs:

• Missing cron task