Bump version to 1.0.0.

I consider crosstool-NG to be stable enough that a 1.0.0 release is acceptable.
I've been using it daily since a long time without really serious _crosstool-NG_
bug (although there are a few minor ones).

There is still a lot of work, especially with Super-H and IA64 support, which
are both marked EXPERIMENTAL.

Enjoy!

 # Compute IA-64-specific values

 CT_DoArchValues() {

     # The architecture part of the tuple:

     CT_TARGET_ARCH="${CT_ARCH}"

 }