646085d701
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