Sorry, I can't come up with one word descriping all this, so I hope I can explain it insteed.
After 1 year in my compagny I will release Version1 right.. After Another year, I release Version 2 with new features and stuff.. and so on.
So lets say I have relased 3 versions, how can I keep track of all my changes, is there somekind og tags on each changes? Or even better, some kind of merge tool for this?
Specific example:
A change could be if I wanted to rename a colum name, from one version too another.