Fix duplication in Ship to Multiple Locations ext

This should solve the issues related to multiple locations getting
duplicated costs.
Add Iranian States
Update version number
indendation Improvement for WC_Cart
Use of time constant
OOPS! again time constant
Better docblock ;)
New line for docblock
Converted Indentations to tabs
better at get_option() @ L91
Found and fix docblock comment
check_cart_item_validity() should have have public
@access public in docblock
Reverted access public

Thanks! @tamarazuk
Merge pull request #6245 from 75nineteen/master

Fix duplication in Ship to Multiple Locations ext
Merge pull request #6258 from shivapoudel/patch-2

Some changes in WC_Cart
Merge pull request #6246 from michaeltieso/master

Add Iranian States
WC order status conflicting with WP post_status (only with 'pending' post_status)
:) some standard
With comma and some more ;)