Latest changes to the auto-documentation is the linking of String command line tools with plug-in handlers. With this addition, now all programs should print the supported file types in their help output, and the man pages and on-line help is also updated accordingly.
What is still missing is that help also informs the user what pixel types a file type supports and whether multiple images can be stored in one file.
In addition, it turned out that the Singleton instance() function is not re-entrant - i.e. a plug-in string parameter handler link back should currently not link to its owning plug-in handler, otherwise the initialization will deadlock.