Option to limit data rate

Add a command line option to allow the user to set a maximum data rate over a specified period of time. This would serve two purposes:

1. Prevent unnecessary disk writes in case of runaway output
2. Preserve data prior to runaway event that may be useful to diagnose the condition

Start by locating the command-line option handling and the stdin-to-file write path described by the repository. Define how the maximum rate and time period are configured, how runaway output is detected, and how earlier data is preserved; done means the option limits writes while retaining useful pre-event output.

Written by the indexing model from the issue text.