* use the same header in all configure.in's and Makefile.am's

* use the same header in all configure.in's and Makefile.am's
* NEWS: improved support for BeOS and Cygwin
* TODO: ILD branch was merged, all internal variables and macros
  are now documented
* demo/Makefile.am: use $(LIBS) instead of -lm
* doc/libtool.texi: documented new variable hardcode_into_libs
  and thread_safe_flag_spec, renamed all AM_ENABLE/DISABLE_* macros
  to AC_*, documented AC_DISABLE_FAST_INSTALL and AC_LIBTOOL_DLOPEN
* libltdl/ltdl.c: added two new error messages (cannot_open_error,
  cannot_close_error), use them where approriate,
  BeOS support (thanks to Xavier Pianet), on BeOS search modules
  additionally in ADDON_PATH
* libtool.m4: rewrote AC_CHECK_LIBM: BeOS and Cygwin don't have
  libm and *-ncr-sysv4.3* requires libmw
* ltconfig.in: don't check for LoadLibrary, hardcode dlopen
  configuration for BeOS and Cygwin
* ltmain.in: fix sourcing of .la files on Solaris
  (patch by Raja R Harinath)