release 1.77

VERSION 1.77 (03/19/2016)

[send_invoice.php] Bugfix: Use function getimagesize() with image path since url does not work properly if php ini option allow_url_fopen is set to 0 (reported by JPS77)
[pngthumb.php] Added transparency to the png thumb resizing
[view_overview.php, view_item.php] Bugfix: png thumbs did not show up
Updated Lightbox2 to v2.8.2 (responsive slideshow) (reported by CodeALot)
[view_overview.php, view_item.php] Changed js method to set the Lightbox2 options
[lightbox2/css/lightbox.css] Moved css definitions of Lightbox2 to file frontend.css
[save_form.php] Bugfix: Escaped hyphens inside of the regexp character class definition of the address form validation (reported by sky writer)
Reworked the character class definitions of the address form regexp patterns using unicode scripts
See: www.regular-expressions.info
Removed deprecated list of special latin characters in config.php
[languages/RU.php] Added russian language file (thanks to Klimentiy)
Added cyrillic characters to the address form regexp for russian language support (thanks to Klimentiy)
Added feature to cancel an order. The ordered items will be put back to the stock and the order moved to the archiv (thanks to dessauer)