Replaced ztrans functionality for material transitions below a given depth to a more general transition behavior which allows transitions in at any constant x, y or z value

Added output of yield_ratio and did minor cleanup; moved ziso stuff into bc_definition derived data type

Added Jean's subroutine for moving surface points along a normal to coincide with the zero of the LSFs

Added integer 'matnum' (material number) to osolve. Added logical 'nest' to parameters. Cleaned up a bit.

change intent 'in' to 'inout' to match perceived usage, comment ddqsort_s; it caused compile problems