Even in the late 90s, source code revision control was a dark art: either you used extremely expensive proprietary systems or else you used CVS which was very l

Even in the late 90s, source code revision control was a dark art: either you used extremely expensive proprietary systems or else you used CVS which was very low level and completely lacked integration with any bug tracking system. Merging in a big feature in CVS was a nerve-racking experience.