Add an autogen.sh script as is customary for autoconf based
projects. Also update the documentation to steer people to
use this scripts.


git-svn-id: http://seriss.com/public/fltk/fltk/branches/branch-1.3@10029 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
Catch WM_QUIT and convert it to SIGTERM. This gives Windows
applications a convenient way to request termination, rather
than forcing it. And it does so in a way that mimics UNIX's
way, allowing code reuse.


git-svn-id: http://seriss.com/public/fltk/fltk/branches/branch-1.3@10030 ea41ed52-d2ee-0310-a9c1-e6b18d33e121