* src/funclib.c, src/funclibhelper.cP: Add AppendVector, plus a few
	  minor fixes

	* lib/sets/basic.gel: improve performance, and fix sets of vectors

	* lib/linear_algebra/misc.gel: Add MakeColumnVector (alias to
	  MakeVecctor), MakeRowVector

	* help/C/genius.xml: add docs for the new functions