Minor addition and fixes to code related to transmitters, skeletonisation and CAVE tokens

[alexanderbates]

• updates to work with different CAVE projects
  • pass domain to chunkedgraph_token and
  • add domain argument to flywire_fetch, so that fafbseg can work with other, non-flywire projects more easily, e.g. CRANTb
• export as.neuron.navis.core.dotprop.Dotprops
• updates to transmitter paper reference and management of transmitter labels for FlyWire-FAFB synapses
• updates to skeletonisation function,
  • do not pass methods to py_run_string, enable different reroot methods
  • heal attempt only if >1 trees in skeleton

[codecov]

Codecov Report

Attention: Patch coverage is 35.00000% with 39 lines in your changes missing coverage. Please review.

Project coverage is 58.09%. Comparing base (e551983) to head (7519583).
Report is 17 commits behind head on master.

Files with missing lines	Patch %	Lines
R/autosyn.R	0.00%	32 Missing ⚠️
R/flywire-skeleton.R	74.07%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #213      +/-   ##
==========================================
- Coverage   58.22%   58.09%   -0.13%     
==========================================
  Files          39       39              
  Lines        5235     5274      +39     
==========================================
+ Hits         3048     3064      +16     
- Misses       2187     2210      +23     

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[jefferis]

@alexanderbates can you explain a bit more about the handling of URLs that you might be fetching vs domains? I don't think they are the same. In particular a token that applies for a certain "domain" might be appropriate to fetch URLs that do not contain that domain name. Can you give specific examples? Contact me privately if necessary.

[alexanderbates]

Ah I see what you mean. flywire_fetch can be given 'domain' to enable it to discriminate between different domains for CAVE projects. This is passed to chunkedgraph_token as an argument called url. It was already called this, I think we can change it also to be domain? We can have both url and domain for flywire_fetch, where by default domain=url for cases where these could be different?