Added example sentences to algorithms that handle NI/ND connectors.

I didn't write example sentences for the algorithm NUMBER-1c because it is yet to be refined into other algorithms that handle specific connectors such as NI*p, NIc, etc.
There's no _num in relex.

There is a _num_quantity  which I think is used for numbers written out with the digits 0-9 ("it uses 300 calories") as opposed to "it uses three hundred calories"  

the wiki page http://wiki.opencog.org/w/Binary_relations looks out of date