closes #23: if temperature zones are all the same, show only one temperature in string representation of Experiment

[dave-doty]

See #23

[codecov]

Codecov Report

Merging #22 (5b1dc26) into main (ba88548) will increase coverage by 12.45%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##             main      #22       +/-   ##
===========================================
+ Coverage   58.44%   70.90%   +12.45%     
===========================================
  Files          19       19               
  Lines        3841     3911       +70     
  Branches      791      803       +12     
===========================================
+ Hits         2245     2773      +528     
+ Misses       1429      920      -509     
- Partials      167      218       +51     

Impacted Files	Coverage Δ
src/qslib/protocol.py	74.32% <100.00%> (+0.04%)	⬆️
src/qslib/scpi_commands.py	98.59% <0.00%> (+<0.01%)	⬆️
src/qslib/qs_is_protocol.py	91.77% <0.00%> (+1.73%)	⬆️
src/qslib/_util.py	95.34% <0.00%> (+2.32%)	⬆️
src/qslib/plate_setup.py	89.65% <0.00%> (+8.27%)	⬆️
src/qslib/base.py	100.00% <0.00%> (+9.52%)	⬆️
src/qslib/experiment.py	77.49% <0.00%> (+13.82%)	⬆️
src/qslib/machine.py	72.78% <0.00%> (+14.98%)	⬆️
src/qslib/qsconnection_async.py	65.46% <0.00%> (+15.26%)	⬆️
... and 1 more

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