Improve performance of source deblending - #2408
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This PR significantly improves the performance of source deblending in
deblend_sourcesandSourceFinder, producing identical results. The multithreshold watershed markers are now built by compiled code. Deblending is typically ~7-30 times faster, both for fields of many small blended sources and for large segments with many markers.The
deblend_sourcesandSourceFinderprogress_barandn_processeskeywords are now deprecated and will be removed in version 4.0. Both keywords no longer have any effect.