Fixed linked list for Sitecore 7.2 and above. #1
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Sitecore 7.2 uses urlhandle to transfer data to the dialog whereas 7.1 and below use the urlstring.
Added a setting so the developer can specify if we're using Sitecore 7.2 and above, or 7.1 or below.
Modified the linklistfield class to choose how to send the data to the dialog based on the setting
Note: setting is currently set to true, meaning that the functionality doesn't change for current usage. Set to false if you want to use 7.2 or above.