Line History Scope

I created a column with 110 lines in it and resized it about 100 times. The history for all those lines was updated each time and now is ridiculous in size. that servlet now takes 40-50 seconds to complete, which means if I click to see a line's history before that servlet completes weird things happen.

We should limit the scale of line history to support such bloating in the future. Perhaps only look back at the last 5-10 things that happen to a line and archive the rest so the API -> UI is only responsible for a portion of the history, not all of it.