rsetienne/DAISIE: v4.1.0

DAISIE 4.1.0 Rework IW simulation code to: Produces full stt tables. Can run with conditioning on number of surviving species to the present. Added DAISIE_CS_max_steps() to manually change the maximum number of integration steps for the CS C++ integrators. Renamed and reworked simulation architecture. Renamed totaltime to total_time. Integrators from package 'deSolve' are reinstated as the default ODE solvers. Added stac_key vignette detailing possible statuses of colonist lineages. Use LazyData