UP-3750 - Print portlet container

Adding print support with jquery, adapted from one ESUP's script, this could be a startup for print view.

This commit add in portlet description the parameter "printable", by default the value is false. So to add the print action edit portlet parameters and change/add "printable" to true.

Just a warning on the given icon, it's the portlet_icons.png and portlet_icons_flat.png modified and named as portlet_icons_with_print.png and  portlet_icons_with_print_flat.png, to avoid to change in origin icon, so feel free to adapt the origin icon, and so get back the background-image url changed for in css files.