sophie strey

WIP: add discrete_events to DSL

1

Adds `@discrete_events` option to the DSL such that reaction_system can be can be written in the following way: ``` rn = @reaction_network rxs begin @variables t @parameters k @species A(t)...

Adding events macro to reaction network DSL

2

One possible way of doing this is the following: ```julia rn = @reaction_network rxs begin @variables t @parameters k @species A(t) B(t) k, A --> B @discrete_events begin (t ==...