Add sorting, faster demo, primitive initFileArray type check

Add sorting via command-line via nio order & nio emerge. These also show how to use the new x.save and var y = initFileArray[..](..) APIs.

Fix a couple bad bugs in nio cut and minor formatting stuff in nio moments.

Add a simple, faster demo that is basically a single-core memory BW benchmark (that also shows how to use initFileArray..). Also add a stays-in binary table generator.

Also add some guards to allow bypass of bounds checking in -d:danger mode.