MAJOR CHANGE: Remove nu and propensity_functions from ssa(), instead
expect a list of reaction() objects. This function provides a much more
natural interface to specifying the effect and propensity of a reaction.
MINOR CHANGE: Apply small allocation optimisations to ssa_btl, ssa_etl and ode_em.
MAJOR CHANGE: Remove
nuandpropensity_functionsfromssa(), instead expect a list ofreaction()objects. This function provides a much more natural interface to specifying the effect and propensity of a reaction.MINOR CHANGE: Apply small allocation optimisations to
ssa_btl,ssa_etlandode_em.