buffer limiting fixes, include "flstring.h" instead of <string.h>,
and replace all use of bool, true, and false, with char, 1, and 0.
(bool is not universally supported by the C++ compilers we currently
use with FLTK 1.x, so 1.x cannot use bool, true, or false without a
lot of configure crap that will make use/distribution a lot more
difficult...)
git-svn-id: file:///fltk/svn/fltk/branches/branch-1.1@2132 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
