fix calls to lenstronomy for new version

[smericks]

• PointSource() now takes in 'lens_model' instead of 'lensModel' as a kwarg (change to config_handler.py)
• remove use of a private function in MainDeflector.simple_deflectors.py

[sibirrer]

@swagnercarena this PR should be merged ASAP to guarantee consistency with lenstronomy. I think the issue with the test failing is that paltas required an older version of lenstronomy

[swagnercarena]

The changes look correct, but it seems like the pip version of lenstronomy did not include this new feature when the tests were run. Let's try to get the tests to run again to make sure everything is in order now.

[swagnercarena]

@smericks, can you modify the lenstronomy requirements to the new pip version with this change? That should also trigger the tests to run again.

[smericks]

@swagnercarena @sibirrer So the switch from_import_class() to lens_class() happened Oct 27th (lenstronomy/lenstronomy@f815d06)

But the latest pip version of lenstronomy is from Sep 28th (https://github.com/lenstronomy/lenstronomy/releases/tag/v1.11.5)

So I don't think this change is compatible with a pip release of lenstronomy yet. Since I'm working with more up to date lenstronomy than the pip release, I tried to jump the gun on changing this.

[swagnercarena]

Okay, let's circle back to this pull request once the newest pip version of lenstronomy is compatible with the change. Thanks @smericks!

[sibirrer]

Okay, let's circle back to this pull request once the newest pip version of lenstronomy is compatible with the change. Thanks @smericks!

ah, I see. On my way for a new lenstronomy release and then ping here. Thank you!

[sibirrer]

@smericks @swagnercarena lenstronomy version 1.11.6 is available on pip

[coveralls]

coverage: 94.973%. remained the same
when pulling 9956d05 on smericks:updated_lenstronomy
into 6f6e9ec on swagnercarena:main.