Wed Oct  8 13:12:43 1997  Philippe Bekaert  <philippe@flater.cs.kuleuven.ac.be>

	* lookup.c: lu_shash() hashing function finetuned. Number of
	collisions reduces drastically (from about 100/access for
	a 10,000 vertex scene to about 10). The number of collisions
	can still be reduces further to about 3 (and truly independent
	of table size), but the effect of this is unnoticable in
	the execution time statstics. 

	lu_find(): cleaned up + collision resolution loop rewritten
	to be more efficient (factor 2 speedup when there are many 
	collisions)

	statstics gathering implemented: can be enabled by defining the 
	LU_STATS symbol.

Tue Oct  7 11:10:55 1997  Philippe Bekaert  <philippe@flater.cs.kuleuven.ac.be>

	* parse.h, parser.c: mg_open recognizes file extensions .Z and .gz +
	filenames starting with a '|' are considered to contain a command
	for piped input. Requires addition of a flag "ispipe" to the
	mg_fctxt struct.

	* parser.h, context.c: client_data field added to the C_VERTEX struct, so
	the "client" can keep data with an MGF vertex (e.g. own vertex data)
	This client data is initialized to zero when the vertex is created, but
	is further to be maintained by the client.

	* context.c: akward vertex clock maintainance fixed (when requesting a
	vertex for the first time, the clock value was not 1 if malloc() on your
	system happens not to clean freshly allocated memory, e.g. Solaris.

	* Makefile: introduction of compile flags (MGFFLAGS) specific for this 
	directory. Compilation without "register" directive for variables leaves
	more opportunities to the compiler for optimisation.