Simplified symbolic parameter generation function

Removed many unused/complicated options.

Ouput symbolic variables can now have more specific stability assumptions (at the level of the whole network still though).

Output uses shc_lv_nu2gammadelta for four parameter case. This means that gamma and delta are now in terms of alpha, beta, and nu rather than being simple variables with their own assumptions. This is less than desirable, but it simplified the code for now.

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