working on bndry adjustment for curved bottom
compiles and runs, need to change particle initialization
think i fixed bug in getU BCs, nj should have been ni
fixed seg fault, particle tracking works for sloping bottom
changed rk4 and fixed sloping bc
continue particles works
fixed bug in xxp on right boundary
changed to faster kdtree algorithm (from brute_force)
added x increment to initialize particles
getting up to speed after merge