Astroscrappy

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- No changes yet.

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- Updated package infrastructure.
- Fixed compatibility with Numpy 2.0 and recent versions of SciPy.
- The minimum supported version of Python is now 3.9.
- Change to normalization for convolution fine structure method to instead use a matched filter.

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- Added the option to add a variance array
- Added the ability to subtract a background array rather than a single value.
- To accommodate these changes, we now return the cleaned array in the same units as the user provides, ADU rather than
electrons and with the background included.

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- Updated to newest version of astropy package template.

- Fixed median cleaning. There was a subtle bug that the crmask was defined as a unit8
array. This was then used to clean the image, but this acted as indexes 0 and 1 rather than
a boolean array that was intended

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- Fixed setup_requires so that it doesn't install astropy when using egg_info.

- Pinned coverage version to 3.7.1.

- Removed dependence on endianness in tests

- Fixed build issues on windows

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- Updated URL in setup.cfg.