Extract helper logInfo, etc. library functions into their own local library

[komish]

One of the net-new scripts being added #314 samples a couple of functions that basically help print [Info] ... type statements.

These should be extracted and used throughout our scripts.

Alternatively, the logging library within the stdlib could be used, but as logging needs for our scripts are, and should remain, pretty minimal, using a logging library may be overkill.