Original commit message from CVS: * docs/plugins/Makefile.am: * docs/plugins/gst-plugins-ugly-plugins-docs.sgml: * docs/plugins/gst-plugins-ugly-plugins-sections.txt: * docs/plugins/inspect/plugin-siddec.xml: * ext/sidplay/gstsiddec.cc: * ext/sidplay/gstsiddec.h: Document siddec.