Replace share-link input by a p element.

Because it is much easier to size it (Was actually broken in firefox)
And only apply it to the actuallink...
Fix for Chrome to only select the content
Fix diff with first image.
Show original timestamp in title
Add cursor-css to "more info" link
Merge pull request #73 from MaPePeR/sharelink-improvements

Sharelink improvements, imagediff fix, original timestamp and cursor