checkSignals:
Check the CNOlist and model matching
Description
This function checks that all the signals in a CNOlist match to species in the
model. It also checks that the CNOlist and Model lists have the right format and
contain the right fields. It is called by the preprocessing function so there is
no need to call it directly anymore if you use the preprocessing function.
In version 1.3.20, check of inhibitors and stimuli is also performed.
If the formats are wrong, this function produces an error. If the
signals/inhibitors/stimuli do not match the species, this function produces a
warning that explains which signals does no match any species.