[ENH] topoDotprops modified

[dokato]

Modifies topological dotprops by directing the orientation of all vectors so they always point towards soma direction.

[jefferis]

Thanks so much @dokato. Can you remind me during the week to get the test data back up on flybrain? I didn't check yet if this is the only issue in the failures above.

[codecov[bot]]

Codecov Report

Merging #502 (d4362df) into master (bf22fbd) will increase coverage by 0.05%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #502      +/-   ##
==========================================
+ Coverage   76.90%   76.96%   +0.05%     
==========================================
  Files          48       48              
  Lines        5923     5938      +15     
==========================================
+ Hits         4555     4570      +15     
  Misses       1368     1368              

Impacted Files	Coverage Δ
R/dotprops.R	85.77% <100.00%> (+1.05%)	:arrow_up:

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