[BUGFIX] Replace the PHP short tags

The short tags could lead to problems with PHP v5.4
[TASK] Change category URL

Because blog is the main page here
[TASK] Add the date to link entries

Adds the "posted on …" line also for blog entries of type "link" to
the template for the blog overview page
[TASK] Add the date to link entries

Adds the "posted on …" line also for blog entries of type "link" to
the template for the blog overview page
[TASK] Improved some spacing and code display formatting
Merge remote-tracking branch 'mrimann/linkdate'