WAI Accessability in function.print.php

[alby]

For WAI-ATAG issue, I have expanded function.print.php with:

- title: Text to show for title attribute. If blank show text parameter.
- class: Class of link.
- more: Place additional options inside the link.

- src_img - Show this image file. Default images/cms/printbutton.gif
- alt: Text to show for the alt of tag if showbutton is sets.
- class_img: Class of tag if showbutton is sets.

Patch

Alby