The src2 directory is on the class path, but it is generally empty.
It is for transient transpiling of JAR file contents only. 


After transpiling:

1) move src code to srcjar
2) edit README_SWINGJS.txt in main directory of the code
3) add a zip-up target in build-zip-jars.xml (to libjs directory)
4) add an unzip target in build-site.xml (from libjs to site directory)

BH 2018.07.03