trunk merged into MELT branch, and improved build

[Basile Starynkevitch]

Hello

For information I merged trunk 176576 into MELT branch rev 176583
and the build machinery has been improved.

MELT now requires every MELT module to have its generated .c files available.

Cheers. 

-- 
Basile STARYNKEVITCH         http://starynkevitch.net/Basile/
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