generalizing jones matrix for Nfeeds=1,2

[slosar]

Changes the jones matrix routine to (Nfeeds,2) instead of (2,2) generalizing to any Nfeeds. Down the line Nfeeds can still be only 1 or 2, but this can be changed. This is only a proposal.

Description

See file changes - pretty obvious. Still specialized for theta-phi coordinate system.

[codecov]

Codecov Report

Merging #394 (c28cf25) into main (8092079) will decrease coverage by 0.04%.
The diff coverage is 90.00%.

@@            Coverage Diff             @@
##             main     #394      +/-   ##
==========================================
- Coverage   99.34%   99.29%   -0.05%     
==========================================
  Files          13       13              
  Lines        2126     2130       +4     
==========================================
+ Hits         2112     2115       +3     
- Misses         14       15       +1     

Impacted Files	Coverage Δ
pyuvsim/uvsim.py	99.15% <83.33%> (-0.28%)	⬇️
pyuvsim/antenna.py	96.07% <100.00%> (-0.08%)	⬇️

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