Add emuext pragma and associated instructions. This provides two emulator specific instructions ("log" and "debug") enabled by the "emuext" pragma. This is from a patch provided by tim Lindner <tlindner@macmess.org>. From Tim's submission: ---- I stole the whole patch from Erik Gavriluk. I hope he doesn't mind. :) The two instructions are "debug" and "log". They are enabled with pragmas. I also added them to the manual. Hopefully all is well. ---- Said Erik Gavriluk <erik@bombfactory.com> in response: ...happy to see them picked up in mainline (if you choose to do so)....

If there are no html files in the "manual" directory and there is no
"manual.html" file, it means that you have either checked out the source
repository on a non-release branch or the packager messed up.

In either case, if you have "docbook2html" installed, you should be able
to build the manual with one of the following:

docbook2html -o manual manual.docbook.sgml

or

docbook2html -u manual.docbook.sgml && mv manual.docbook.html manual/manual.html

PDF can be generated by doing:

docbook2pdf -u manual.docbook.sgml && mv manual.docbook.pdf manual/manual.pdf