Changes

Summary

1. fix tail flex model to use theta from bending model (details)
2. have tailboom inhereit from spar model (details)
3. use single model for tail boom bending, call beam model in bending (details)
4. allow for dynamic inheritance of tailboom model; constrain moment in tb (details)

fix tail flex model to use theta from bending model

have tailboom inhereit from spar model

use single model for tail boom bending, call beam model in bending

allow for dynamic inheritance of tailboom model; constrain moment in tb
bending