Implementation of uimenu objects for fltk backend

[Kai Habel]

 Hello all,

I have been working on the uimenu functionality lately. It allows the 
user to create custom menus when using the fltk backend. I have attached 
two changeset which implement the uimenu function:

Changeset.uimenu.go: Implements the uimenu graphic object and the 
respective m-file. This changeset should be complete including 
Changelog, NEWS  entry, etc.

Changeset.uimenu.fltk: Implements the uimenu function using the fltk 
backend. This changeset is for review so far. Since I expect some 
comments and changes afterwards, I have not included the Changelog, etc.

I have tested it a lot on linux (32bit intel /intel graphic and 64bit 
amd/nvidia graphic), but I may have missed some issues. Please give it a 
try and report back problems you encounter. I am also interested in 
feedback from Mac and Windows users. I hope Shai is back soon, so that 
he can have a closer look ;-) I have attached a menu_test.m file for a 
quick test.

Q: How can I use "graphics.cc: xget_ancestor (const graphics_object&, 
const std::string& )" in fltk_backend.cc? So far I have just copied the 
function.

I have noticed some problems with callbacks, I will report them to the 
bug tracker later.

Kai

Changeset.uimenu.fltk
Description: Text document

Changeset.uimenu.go
Description: Text document

menu_test.m
Description: Text Data