- Changed the way that daemon excludes get anchored to the module dir

- Changed the way that daemon excludes get anchored to the module dir
  to use the new "dirbuf" (setting it through a new accessor function)
  and a new XFLG_ABS_PATH flag.
- Made anchored rules read in from a per-dir merge file relative to
  the merge file's directory.  This makes it possible to set each rule
  to either be "inherited" or not based on if it is anchored.
- Got rid of the -i (inherited) option for merge files.
- Set a MATCHFLG_FINISH_SETUP flag on each per-dir merge file instead
  of using a high-water "initialized_mergelist_cnt" index.
- Make sure that any merge file that starts with a dash does not get
  its name interpreted as an option when sent over the socket.