Workplane.rect: test and document negative lengths

[marcus7070]

Will close #773.

[codecov]

Codecov Report

Merging #774 (c6e56b0) into master (05e42a7) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #774   +/-   ##
=======================================
  Coverage   94.65%   94.65%           
=======================================
  Files          32       32           
  Lines        7256     7265    +9     
  Branches      789      789           
=======================================
+ Hits         6868     6877    +9     
  Misses        255      255           
  Partials      133      133           

Impacted Files	Coverage Δ
cadquery/cq.py	91.32% <ø> (ø)
tests/test_cadquery.py	99.18% <100.00%> (+<0.01%)	⬆️

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[jmwright]

Thanks @marcus7070 !

[adam-urbanczyk]

Thanks @marcus7070 - merging.