controlling mnesia db size

genexpire something quick that we rolled together to satisfy our paranoia about out-of-control databases (ram based dbs are especially worrisome). Basically, it periodically runs and enforces a maximum size for each database fragment (which depends upon how many fragments are on the node; in practice this means you get the space of your most crowded node in a distributed config. With fragmentron things are balanced to within one fragment so with enough fragments this is ok.)

Now available on google code.