Adding simulation tools to mobsim#36
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these functions were initially developed in another package working on top of mobsim
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New functions for step-by-step simulation dynamics: - create_motherpoints(): generates random mother point coordinates per species - jitter_motherpoints() / jitter_species(): applies per-species random jitter to mother points or all individuals - drift_x/y_motherpoints() / drift_x/y_species(): applies fixed directional drift - replace_individuals(): reassigns species identity by local neighbourhood composition - torusify() with methods for mother_map, community, data.frame, and numeric: wraps out-of-bounds coordinates around like a torus - community2ppp(): converts a community object to a spatstat ppp - create_random_ID(): generates random alphanumeric identifiers Tests: structural, invariant, reproducibility, and snapshot tests for all new functions; fixed four duplicate test names in test-drift_motherpoints.R. Vignettes: added knitr opts (dpi: 72, fig.retina: 1) to all five vignettes to reduce embedded image size by ~75%, bringing the total package archive weight from ~8 MB down to an estimated ~2.5 MB. Misc: version bump to 0.3.3, RoxygenNote updated to 7.3.3, fixed duplicate Description line, removed spatstat.geom from Suggests (it is in Imports). app layout update
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New functions allow randomly moving clusters and/or individuals at each time step, and simulate reproduction.