[Axiom-developer] Build machinery -- support for out of source build

[Gabriel Dos Reis]

Hi,

  This message contains no code.  It is a head up.

The current build machinery in silver does not support out of source
build.  

That is wrong.  

We must be able to build Axiom in a directory different from the one
that contain the source code -- for exemple the source code may live on a 
read-only media, such as a CD.

Also, I suggest the elimination of the "int/" subdirectory -- I know
what it is there for, but that is the wrong way of achieving what it 
is supposed to do.

Notice that all the changes I propose are already implemented in
build-improvements. 

Comments?

-- Gaby