updated documentation for new lcomp constant function

Conflicts:
	R/ss3sim_base.r
	man/change_bin.Rd
added robustification constant for length comps
updated documentation
incorporated function into ss3sim_base and run_ss3sim functions
updated testing code and added cases
fixed small bug for lcomp_constant was passed the wrong arguments
reran document()
small fix to testing code
fixed small bug, value cant be zero or ss3 fails
Merge pull request #158 from ss3sim/feature/change_lcomp_constant

Feature/change lcomp constant