Adaptation for Publican.

Publican 3.0 now available under Windows.
That was the opportunity to test...
The results are disappointing : font too small, poor quality of graphical syntax diagrams.
I tested pdf and svg images : not supported.
More work needed in sd2image.rexx : With Publican, all the images must be stored in the 'images' directory (currently, each XML file has its own sd_file directory).
ooRexxShell & pipe : keep it compatible with standard ooRexx
Coroutines : notes updated