Update names and images of social network links.
Add menu links for social networks also to the default tjger about dialog.
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.