+2004-07-26 Martin Quinson
+ Version 0.3 (protocol not changed; ABI changed)
+ - Major overhault of the datadesc interface to simplify it:
+ - shorted the function names:
+ s/gras_datadesc_declare_struct/gras_datadesc_struct/ and so on
+ - add a trivial way to push/pop integers into the cbps without malloc.
+ This allows to make really generic sub_type description, which simply
+ pop their size of the stack.
+ - add a function gras_datadesc_ref_pop_arr() which does what users want
+ most of the time: Declare a dynamic array (which pops its size of the
+ stack) and declare a reference to it. Poor name, but anyway.
+ - kill the post-send callback, add a post-receive one
+