make flywire_raw2nm() use vox dims if supplied

[jefferis]

• closes #158
• with test

[codecov[bot]]

Codecov Report

Merging #169 (1f57d0f) into master (f2cf567) will decrease coverage by 0.01%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #169      +/-   ##
==========================================
- Coverage   51.04%   51.03%   -0.02%     
==========================================
  Files          33       33              
  Lines        4114     4113       -1     
==========================================
- Hits         2100     2099       -1     
  Misses       2014     2014              

Impacted Files	Coverage Δ
R/flywire-coord.R	78.12% <ø> (-0.67%)	:arrow_down:

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