convert silent failure when reaching ls_max_fn to stop error.

[cdriveraus]

This caused me a little headache to figure out where the failure 'bracket_step not found' was coming from.

[jlmelville]

Thank you for the PR, I'm sorry the error handling and message wasn't very helpful in this case. I will get a new version into CRAN ASAP.

If possible, rather than stopping, I will try and make the behavior so the optimization terminates with a specific message so you can keep whatever progress has been made.

[jlmelville]

I believe I have reproduced the error, and have added a test for it. As mentioned above, rather than just a stop, the optimization should now continue as best it can.

@cdriveraus, if you are able to install the current master branch from github (e.g. via the devtools or remotes package), it would be good to know if this fixed the issue for you. Otherwise, I have submitted a new release for mize to CRAN and version 0.2.2 should hopefully show up soon with this fix.

At that point, I will close this PR rather than merge it, due to the conflict resulting from the difference in the code. If the problem isn't solved for you, please re-open (or file an issue).

[cdriveraus]

Great. I don't have the specific problem up anymore so it would take some fiddling around, I think as long as you've a test that hits ls_max_fn that's all is needed. Thanks for the work on this package, best optimization results I could get after trying a lot of R options :)

[jlmelville]

Glad the package is of use. Version 0.2.2 is now on CRAN. I will close when the binaries show up.

[jlmelville]

Binaries are on CRAN. Closing.