Nikamap

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Added
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* Boostrap sampling

Fixed
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* use the new astropy low_level_wcs interface when present (astropy 4 compatibility)
* general piic format (rgw instead of snr)
* Refactor Jackknife

=============

Added
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* `PIIC_fits_nikamap_reader` to read fits file produced by PIIC

Fixed
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* resolve astropy v4 unit handling issue in powspec_k

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Added
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Fixed
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* photutils API change in v0.7

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First published version. See documentation