Major updates: qr code fix, htaccess modyf, hardcoded path fix, removable short_urls in config.

On theme stikkedizr  was missing qr code, additionally there was a mess with expiration dates of pastes with missing language translations.
This changes fixes both issues.

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Another commit allows to place an sitemap.xml file and gives possibility to validate the site by Google webmasters tool.

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Fixed hardcoded path to application directory (used APPPATH).

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Removable short_url checkbox - configurable in confing/stikked.php
All themes has been updated.

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Geshi update to 1.0.8.12

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