Update Notation section
JA2.2 Empirical n-VR curves
JA3.1 Add flexible keyword
JA2.2 Friction factor
JA2.9 Drag coefficient dependent on morphology
JA4.4 Surface waves and eddies
JA4.1 Justification of extreme velocities
JA4.3 Justification of fully submerged trees
JA5.1 Trees discarded once sign of decay
Add bending stiffness table and simplify table captions