Multiply D/dx4 through without extra function
Allows interactive query of class vars/functions
Automatic module reloading
Start work on Neumann b.c., typo fix
Boundary condition exploration
(1) Discovered real Dirichlet conditions that allow a free-floating boundary!
(2) Have a freely-pivoting but currently 0-displacement no-moment,
    no-shear (2nd and 3rd derivatives = 0) boundary condition

Really excited about this -- not only am I finally teaching myself how to
do this, I can see these boundary conditions erasing the near-boundary error
issues I was coming up against earlier.