This is the original Java source of isub.c.  We keep it here to simplify
tracking of possible changes in the original source. This was downloaded
Mar 3, 2011 from

	http://www.image.ece.ntua.gr/~gstoil/software/I_Sub.java.

Apr 21, 2021 The above was lost. I   found the file again on the address
below. Downloaed.

	https://github.com/lmazuel/onagui/blob/master/src/main/java/fr/onagui/alignment/method/I_Sub.java