Add links for the link images in the about dialog.
Move more data for social network links from tjger to hgbase.
Add default images for social network links.
This commit was manufactured by cvs2svn to create tag 'v_2_6'.
Add a default way to add links to the menu and the about dialog.
New method to ensure the size of a collection.
Fix bug in for saving a String array.
Extend some (gui) utility methods.
Fix NPE when trying to play a sound where the file does not exist.
Add a method to shorten a string.