This function is a support function for the selection of a subtype in a
readX function. In addition to the subtype selection it also performs some
consistency checks.
Usage
toolSubtypeSelect(subtype, files)
Value
The file name corresponding to the given subtype
Arguments
subtype
A chosen subtype (character)
files
A named vector or list. The names of the vector correspond to the
allowed subtypes and the content of the vector are the corresponding file
names.