gsubfn-chron		read in zoo data with chron datetimes.
gsubfn-cut		Use strapply to extract endpoints from cut labels.
gsubfn-gries		Stefan Gries' Linguistics code.
gsubfn-lower		Makes all letters in words lower case except first.
gsubfn-si		Replace SI scale letter with number.
gsubfn-unitTests	Run gsubfn unit test suite.
