construct.statevariables: Construct the streambugs ODE state variable names
Description
Construct encoded labels of streambugs ODE state variable names from reach
names, habitat names, and "taxa" names for at least one of the POM, Algae, or
Invertebrates groups.
reach names character vector; duplicates are dropped
Habitats
habitats names character vector; duplicates are dropped
POM
optional ("taxa") character vector of POM (particulate organic matter) group;
duplicates are dropped
(note: at least one "taxon" name out of all groups has to be given)
Algae
optional taxa character vector of Algae group; duplicates are
dropped (note: at least one taxon name out of all groups has to be given)
Invertebrates
optional taxa character vector of Invertebrates group
duplicates are dropped (note: at least one taxon name out of all groups has