* src/eval.c, src/structs.h, src/parse.y, src/lexer.l, src/calc.c,
	  src/matrixw.[ch]: add increment and swapwith operators which
	  are quicker ways to do these common operations.  swapwith does
	  not yet work with ranges, something that should be remedied.

	* src/funclib.c: improve inline docs for rand and randint

	* src/geniustests.txt, src/testscope.gel: add tests

	* lib/linear_algebra/misc.gel: add ShuffleVector, fix some other
	  functions to accept null

	* lib/*/*.gel: use increment and swapwith, remove some unneeded
	  trailing semicolons

	* help/Makefile.am, help/genius.txt: add the genius.txt back into
	  the distribution

	* help/C/gel-function-list.xml help/C/genius.xml: document new
	  features and functions