Vanishes before matcher.
Fixed one client, readying.
Lint.
Now with ulps.
Merge pull request #322 from pleroy/Matchers

A matcher named VanishesBefore to check values which are expected to be 0.
Un p'tit blanc sec.
Merge pull request #323 from pleroy/Matchers

Un p'tit blanc sec.
Safety checks.
Merge pull request #324 from pleroy/Barycentre

Safety checks in physics::Barycentre.
First implementation.
Test.
Test passing but code commented out.
Template magic.
More template magic.
A solution that works if you holf your nose.
Things are getting complicated with quantities.
Now with Quantity.
Cleanup.
<< degrees_of_freedom
operator<< for std::unique_ptr