One demo script "watch-process-smaps" and two for info lookups

- script "watch-process-smaps" shows changes in memory usage
over time for a given process.  Uses /proc/#pid#/smaps file.

- scripts "field-name-to-label" and "field-label-to-name" are
very simple utilities for translating the ProcFieldConstants
variable names to/from the values they display when describing
fields in /proc datasets.