Tartarus CVS: buttress simon

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CVSROOT:	/home/cvs
Module name:	buttress
Changes by:	simon	01/12/14 12:44:14

Modified files:
	.              : buttress.h error.c keywords.c main.c 

Log message:
Keywords are now collected using a B-tree rather than an array with
heapsort. This makes the code much simpler for a start, but the main
reason is so that we can spot duplicate keywords as we go along
rather than having to wait until the end of input processing.