Time to do some actual work.
Merge branch 'master' into relative-error
Merge branch 'master' into relative-error
Merge branch 'master' into relative-error
Merge branch 'master' into relative-error

Conflicts:
	testing_utilities/numerics_test.cpp
double
Merge branch 'master' into relative-error
blaaah
Merge branch 'master' into relative-error
Add decls
Merge branch 'master' into relative-error
Stub bodies
Dimensionless, dimensionful.
R3Element.
Forget done.
Tests failing
Test passing.
Merge branch 'master' into Permutations
Readying.
Moar tests.