refactoring. add errorformat and commentstring.
add dtplugin
fix errorformat
fix codeformat.
added rbtnn to AUTHORS
update errorformat
Split non-syntax settings out of syntax into proper files
Set standard options (fo, com, cms) and add guards and undo
Merge pull request #8 from dbarnett/master

Split settings out from syntax into proper files and add missing settings
fix about notes. (thanks dbarnett, sigmundch)
Merge pull request #7 (refactoring. add errorformat and commentstring.)