Initial structure for supervisor-mode

The full process hierarchy isn't set up yet, but these changes
help prepare by doing two things:

- Add a -j option to enable supervisor-mode.  Currently, just a single
  "stem" process gets forked early on to be used as the basis for
  further forking into real cluster nodes.

- Separates the parsing of command-line options from their consumption.
  i.e. need to parse whether we're in -j supervisor-mode before
  modifying any global state since that would taint the "stem" process.
  The new intermediate structure containing the parsed options may
  also serve as a way to pass configuration info from "stem" to its
  descendent cluster node processes.

src/RuleMatcher.h

@@ -221,7 +221,7 @@ public:
 	~RuleMatcher();
 
 	// Parse the given files and built up data structures.
-	bool ReadFiles(const name_list& files);
+	bool ReadFiles(const std::vector<std::string>& files);
 
 	/**
 	 * Inititialize a state object for matching file magic signatures.