Further improvements to new Version 1.2. All unit tests pass.

Unit tests updated a bit to work with some new functionality. All passed.

More bugs fixed. Scalar noise case added back to solvers.Fixed detection of noise type for non-diagonal noise.

sde_euler_validate() now used sde_gbm() directly and is cleaned up.

RandFUN SDE option may now be a atria of integrated Wiener increments. Not fully supported yet and it may change. Code is a bit messy to support this, but it is useful, especially for the updated sde_euler_validate().

Process functions cleaned up considerably. Properly output W in all cases now.

Signed-off-by: Andrew D. Horchler <adh9@case.edu>