Remove extra emission files (#179)

* Fix paths to spectral model files in temperature response

The path to the model for hybrid abundances and photospheric abundances were switched.

* Fix atol in test_temperature_response_coronal.py

Made atol scaled to temperature response to provide a more stringent test.

* Fix atol in test_temperature_response_hybrid.py

Made atol scaled to temperature response to provide a more stringent test.

* Fix atol in test_temperature_response_photospheric.py

Made atol scaled to temperature response to provide a more stringent test.

* Fix atol in test_temperature_response.py

Made atol scaled to temperature response to provide a more stringent test.

* Fix atol, rtol values in test_temperature_response.py

Use atol and rtol values that should lead to passing all tests.

* Fix atol, rtol values in test_temperature_response_coronal.py

Use atol, rtol values that should lead to passing all tests.

* Fix atol, rtol values in test_temperature_response_hybrid.py

Use atol, rtol values that should lead to passing all tests.

* Fix atol, rtol values in test_temperature_response_photospheric.py

Use atol, rtol values that should lead to passing all tests.

* Another fix to test_temperature_response_hybrid.py

needed to scale atol to max value of temperature response

* Another fix to test_temperature_response_coronal.py

need to scale atol to the max value of temperature response

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Delete xrtpy/response/data/XRT_emiss_models directory

These files are duplicates of those in chianti_emission_models

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Jonathan Slavin <[email protected]>