Removed comment from index.php
Merge pull request #1327 from openbaypro/v1.5.6

OpenBay Pro update to latest version for OpenCart 1.5.6.2 release
Updated changelog to show OpenBay Pro update/pull request
Created new bug fix branch for 1.5.6.x -> 1.5.6.3_rc

Fixed PayPal calculation with correct variable.
Fix for image manager issue caused by the new UTF8.php helper update.

Added check for length.
Allow array to be written to log file.

Updated change log to include current changes on 1563 branch.
Check uploaded files for php content, reduce the risk of image files containing php and running on insecure servers.
Fixed report for coupons to search the history table instead
Removed check to allow php files through file upload if they are in the allowed list. PHP are never allowed.
Updated changelog.md with new updates and commits for 1.5.6.3 release.
Updated version number to remove the RC part.
* Fixed issue with images containing the <? (used in xml etc) string in the source and not uploading. Now only checks long php tag.
* Fixed language string for "error_file_type" in admin filemanger/upload method
utf8_substr fix

Should fix upgrade issues caused by PHP consider 0 equal to null
Merge pull request #1359 from opencarthelp/v1.5.6.x

utf8_substr fix
Added change log note for @opencarthelp merge. Ref: #1359

Changed version id to 1.5.6.4_rc until main release.
Updated SQL query in getTotalEmailsByProductsOrdered and getEmailsByProductsOrdered to use the limits in the correct method
Updated SQL mode in install SQL file and MySQLi adapter to accommodate servers that have strict mode enabled by default. Ref: #1347

Removed Amazon payments xls file from system folder as it can be downloaded online and has no place in the code framework.
Improved currency update method to include curl timeouts, to handle occasional timeout issues. Closes #1230
Updated change log to include info and links for 1.5.6.4 release.
Updated version number to exclude _rc