This is obviously not going to work for Unicode strings, but the whole
function needs to be rewritten, so keep it in synch with the other
branches for now.
@ <mbp@humbug.org.au>. (Andrei)
Martin Pool updated the natural comparison/sort algorithm so that fractions
compare more "naturally", e.g. 1.002 < 1.1.
@- Added natural comparison/sorting routines strnatcmp(), strnatcasecmp(),
@ natsort(), and natcasesort(). These are useful for comparing and sorting
@ strings that contain numbers. Based on the code from Martin Pool
@ <mbp@humbug.org.au>. See http://www.linuxcare.com.au/projects/natsort/
@ for more info on natural sorting. (Andrei)