ftoastr: split into 3 modules ftoastr, dtoastr, ldtoastr This is so that a program like Emacs, which needs only dtoastr, does not have to bother with distributing and compiling ftoastr and ldtoastr. * MODULES.html.sh: Document these modules (ftoastr wasn't documented). * modules/dtoastr, modules/ldtoastr: New files. * modules/ftoastr: Now works just for 'float'. (Files): Remove lib/dtoastr.c, lib/ldtoastr.c. (Makefile.am): Remove ftoastr.h (not needed and no effect), dtoastr.c, ldtoastr.c.