Sean Dague 646085d701 Add colorful PS4
PS4 can include functions, so when running in the LOG_COLORS=True mode
provide a grey function line so that it's easier to visually
distinguish the content from the location.

Also make it so the main prompt chunks off all the common path, which
means we can printf to 40 characters and have a pretty reasonable and
readable PS4.

Change-Id: I4a10a49db97d413349bcfceeb8c4164936fbcc40
2016-03-23 07:37:44 -04:00
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