Added support for pruning entries by size or by time.
Whitespace...
A more simplistic approach to pruning. Added exaplanation to the end of readme.
Updated readme to refelct logical time
Small correction in last paragraph of readme
Small correction in last paragraph of readme #2
Updated readme and code to use logical time instead of realtime.
Small update in the readme.
Formatted readme linebreak to 80 chars.
Updated readme to document different flavors of dvvset, in this case it's the prune version