First cut of an API.
Transform.
Remove the last_ functions and fix clients.
Reordering and cleanup.
Clang compilation.
As expected, VS sometimes disagrees with Clang...
Lint.
Merge pull request #255 from pleroy/Transform

Expose Trajectory::Iterator, add a transforming iterator, and adjust the clients
Try to eliminate timeline().
Only errors in rendering_frame.cpp.
Fix RenderingFrame.
Fix warnings.
Merge pull request #257 from pleroy/NoTimeline

Remove the function Trajectory::timeline and fix the clients.
;; -> ;
Merge pull request #258 from pleroy/DoubleSemiColon

;; -> ;
Merge pull request #259 from eggrobin/numerics-logging

Log the numerics.
Body-centred transform.
GetDegreesOfFreedom fries.
Reimplement rendering.
Debugging.