Overview of changes:
 *  Fixed up time tags.
    First, the choice of hexadecimals turned out as wrong: hexadecimals
    end up sorting in strange ways, at least in version contexts.  The
    format was changed to '+%Y%m%d%H%M%S` (eg. `20180511171502`).
    Second, 'ctime' value for MKIT_TTAG was added, which is the same as
    'btime', but represents commit time rather than build time, so it's
    more deterministic---for that reason it's now also the new default.
				
			
				
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