some patches - std::exception, cl_vector, ostream, etc

[logixoul]

- make CL_Exception inherit std::exception [ hope I didn't muck this one up especially wrt throw specifications ].
- catch-by-ref in the examples
- let Vec2 be constructed from CL_Point
- ostream<< for CL_Rectd and others
- x11 little fix/optimization, invoke func_window_resize only on resize, not on move
- rename CL_Rect::is_inside() to CL_Rect::contains()
- add set_top_left() etc to CL_Rect

edit: now with 8bit conversion for CL_Exception::what()

[rombust]

Patch applied.

Many thanks