continue profiling after finding new MLE

When profiling following an mle2() fit, profiling often finds a new better MLE.
Currently profile() then stops and returns the new MLE. This is useful, but it seems like it might be nice to have an option to keep profiling by restarting the profiling with the new MLE. This is what I am doing manually right now.
Thank you!
marm

Start by reading the profile() workflow and how it consumes an mle2() fit, then trace where profiling stops after finding a new MLE. Define the option's repeated-profiling behavior and verify that profiling can restart with the new MLE and stop when no new MLE is found.

Written by the indexing model from the issue text.