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
Merge branch 'master' into relative-error
Dimensionless, dimensionful.
R3Element.
Merge pull request #60 from eggrobin/relative-error

Relative error