* include/cln/version.h.in, src/base/verion.cc: New files.
* configure.in: Generate include/cln/version.h.
* cln.m4: Rewrote it. Check result of cln-config without compiling.
Do cross-check library version and header version information.
* configure.in: ...used here.
* include/cln/config.h.in: Put in macros defined by CL_GMP_SET_UINTD...
* include/cln/types.h: ...used here.
* autoconf/acgeneral.m4, autoconf/aclocal.m4: Adhere to FHS.
- Wrote a check to see if libgmp can be used.
- Added libtool interface versioning (-version-info) for the library.
- Added libtool inter-library dependency for -lgmp. (Libtool should care
if this works on the current platform.)