Frontiers submission release

Frontiers submission release.

Intermediate values computed as extended precision IA ranges

Added Hodgkin-Huxley test model to examples.

Release 0.0.1

• Added mixed interval-affine arithmetic functionality.
• Ranges are trimmed when affine ranges fully contain interval ranges
• Arrpa now requires MPFI to function
• Added Hénon map example program
• Added experimental ODE stepper suite
• Many bugfixes

Testing Release 0.0.0

Public test release version 0.0.0.

Should be considered feature-incomplete, and subject to frequent API / ABI changes.