incorrect syntax synthesizing photometry for highest-redshift targets

[moustakas]

The Iron/v2 VAC ran nearly to completion with tag 2.4.1 but there was a corner-case bug I had previously fixed, recently messed with, and broke again. The issue only impacts the handful of objects in the sample (spanning approximately 50 healpixels) at the highest redshifts (z>5.3 or so) where I have to extrapolate / pad the best-fitting model while synthesizing photometry and computing K-corrections. The error was in the syntax of the padding / extrapolation with speclite.filters.pad_spectrum.

I also added a couple options for generating merged catalogs by survey type (merging over all programs): main, sv={cmx,sv1,sv2,sv3}, and special.

I'm going to do a few more checks and then tag 2.4.2 and finish the Iron VAC.

[github-actions[bot]]

Pull Request Test Coverage Report for Build 6025767125

• 0 of 2 (0.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 59.257%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
py/fastspecfit/continuum.py	0	2	0.0%
<!--	Total:	0	2	0.0%	-->

Totals
Change from base Build 5955234517:	0.0%
Covered Lines:	2471
Relevant Lines:	4170

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