* ltmain.in: Always use $echo not echo for consistency.

* ltmain.in: Always use $echo not echo for consistency.
Changes for darwin building. Warn if linking against libs linked
with -module. Use module_cmds if available and building a module,
move convenience double lib check,
* libltdl/ltdl.c: ltdl support for darwin (first blush)
* libltdl/README: note that darwin is supported
* ltdl.m4: Changes for darwin, and for new shrext
* libtool.m4: Changed the way darwin builds stuff (make check passes)
added module_cmds, module_expsym_cmds and hardcode_automatic and put
them in the libtool script. check for zsh's removal of escapes. Allow
libraries to be stripped on darwin.
* TODO: Remove the todo about zsh's removal of excapes. note that zsh
echo works perfectly well, eval is screwed up. Seems to be fixed in
latest zsh.
* THANKS: added self :)
* f77demo/configure.ac: Use config.h or it doesn't work.