Add splitSource fxn, valgrind flag.

Add:
	vimrc
		-add SplitSource(), which performs the opposite task of SplitHeader(),
		opening an open header file's accompanying C source file.

	zshrc
		-add `--track-origins` flag.

Mod:
	vimrc
		-SplitHeader() now intakes a string argument, typeOfSplit, which
		indicates the type of split (vertical or horizontal) to open the open
		C source file's accompanying header file in.