Original commit message from CVS:
Move plugin example code to new location, and put it into build system.
Add work on firstplugin chapter of pwg.
Fix typo in quotes.
Add @'s before commands in manuals.mak
Original commit message from CVS:
Wrote introduction, and changed name to plugin writers guide (though
files still need rename). I'll leave the filenames as is for now, since
the name might still change again...
Original commit message from CVS:
Added framework for writing filter writers guide.
Extracted much of the makefile from docs/manual into a shared file which
is included, so it can be re-used.