Improved implementation of QueryStatus for the case where multiple command IDs are being checked at once
Provide clean support for the OLECMDTEXT parameter which might be passed to QueryStatus
Fix implementation of CommandFilter.Exec for OLECMDEXECOPT_SHOWHELP
Improved support for OLECMDEXECOPT_SHOWHELP in CommandFilter.Exec
Allow InnerExec to handle the case where _next is null
Updated CommandFilter documentation
Merge pull request #22 from sharwell/command-filter

Command filter improvements