calcs/hazard/classical/core:

Factored out `_update_progress` from the core hazard curve computation task
code. In the future, I want to be able to specifically profile this block of
code, so this will make it easier to distinguish in profiling reports.
calcs/hazard/classical/core:

Renamed `_update_progress` to `_update_curves`.
calcs/hazard/classical/core:

Better debug logging for `_update_curves`.
Merge pull request #1036 from larsbutler/update-progress-fn

Add `_update_progress` for clearer profiling

[r=micheles,matley] [f=*1121825]