Frame compatibility check.
Lint.
Merge pull request #300 from pleroy/FrameCheck

Add a function to verify if a body is compatible with a frame.
First cut.
Partial body centered test passing.
std::map -> std::set
Barycentric test passing.
Bodies test.
More tests and bug fix.
Fix plugin test.
Lint.
Merge pull request #301 from eggrobin/redundant-indexing

std::map -> std::set
After egg's review.
Merge pull request #305 from pleroy/TransformsTest

Test for Transforms.
Digits, epsilon.
Min and digits.
Center.
After egg's review.
Fix a test that was wrong.
Merge pull request #306 from pleroy/1980

1980 got their macros back.