Fix issue #238 and a surpise bug in blimpy/util.py

[texadactyl]

• There were miscellaneous bugs in stax.py w.r.t. frequency range specifications and large files.
• blimpy/util.py rebin() function sometimes crashed due to unexpected dimension input.

[codecov[bot]]

Codecov Report

Merging #239 (97331d9) into master (da8d697) will increase coverage by 0.29%. The diff coverage is 89.21%.

@@            Coverage Diff             @@
##           master     #239      +/-   ##
==========================================
+ Coverage   84.75%   85.04%   +0.29%     
==========================================
  Files          68       68              
  Lines        3417     3457      +40     
==========================================
+ Hits         2896     2940      +44     
+ Misses        521      517       -4     

Impacted Files	Coverage Δ
blimpy/stix.py	90.15% <ø> (+8.33%)	:arrow_up:
blimpy/stax.py	82.91% <80.00%> (-4.51%)	:arrow_down:
tests/test_dedoppler.py	96.72% <91.66%> (-1.59%)	:arrow_down:
blimpy/utils.py	100.00% <100.00%> (ø)
setup.py	100.00% <100.00%> (ø)
tests/test_dice.py	100.00% <100.00%> (+3.57%)	:arrow_up:
tests/test_stax.py	91.66% <100.00%> (+0.75%)	:arrow_up:
tests/test_stix.py	97.22% <100.00%> (+2.22%)	:arrow_up:
blimpy/dice.py	63.10% <0.00%> (+1.94%)	:arrow_up:

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