Remove unused "Allow Downloads" setting

https://github.com/opencart/opencart/issues/867
Graph labels now more accurately reflect info
Improve customer and affiliate privacy
Fix missing totals in order editing

Fix coupon, voucher, reward and credit totals in order editing.
Made loginExpired() method more resilient
Revert "Made loginExpired() method more resilient"

This reverts commit 78929b5d68bb6988cd66de48fcdf88ad797000f2.
Removed session sharing
Order status setting description, closes #15
Added space for legibility to coupon/voucher/etc.
Update admin filemanager traversal protection
Update postcode required defaults
Update United Kingdom address format
Fixes #30 "Undefined index: cart" error
Reduce file_get_contents warnings in cache
Spelling and unit corrections
Admin validation correction
Removed contribution spelling guideline

Removed readme/contribution spelling guideline as OpenCart source is
already inconsistent with British/American English spelling use.

https://github.com/opencart-ce/opencart-ce/issues/33
Add redirect to secure pages

Pages that can be indexed use code 301.
Closes #32 file size prefix standardization

http://en.wikipedia.org/wiki/Binary_prefix
Fix add and remove credit in order info