Remove unused tol parameter

[dfsp-spirit]

This PR:

• removes the unused _tol parameter for the vcgDijkstra function and
• makes it clear in the docs the pseudo-geodesic dist is computed.
• reformats and cleans up the code a bit.

It's easiest to see what is being done by looking at the commits separately, as the third makes it hard to tell what has been done when looking at the combined changes.

One could alternatively implement the parameter, but given the speed of the current solution, I guess that it's not really needed for most meshes (and filtering afterwards can be done in R anyways).

[dfsp-spirit]

@zarquon42b Any opinion on this?

[zarquon42b]

Sorry, I was drowning in work.

[dfsp-spirit]

No worries, I thought you had not noticed the PR. Happened to me once.

And once I mark something as read, it's gone for good. ;)