Hello everyone.

I made some changes to the main_window.c code to add the option to
rotate to the toolbar, but I have a problem with the icons, I can not
find the appropriate, at the moment I'm using
GTK_STOCK_ORIENTATION_LANDSCAPE and
GTK_STOCK_ORIENTATION_REVERSE_LANDSCAPE but I do not think the right
way to express the action to run. Any ideas?

This is my first contribution to the Open Source, I hope that this
patch is well done and that is your pleasure.

Sorry my english I'm using Google translate.