winix can drop privileges now (if started as the root)

added parameters to the config:
 user (string)
 group (string)
 additional_groups (bool)



git-svn-id: svn://ttmath.org/publicrep/winix/trunk@668 e52654a7-88a9-db11-a3e9-0013d4bc506e

core/config.h

@@ -24,6 +24,20 @@ public:
 	// name of the config file (full path can be)
 	std::string config_file;
 
+	// system user name (to which drop privileges)
+	// used only if winix is started as the root
+	std::string user;
+
+	// system group name (to which drop privileges)
+	// used only if winix is started as the root
+	std::string group;
+
+	// setting additional effective groups from /etc/group
+	// by using initgroups()
+	// used only if winix is started as the root
+	// default: true
+	bool additional_groups;
+
 	// log file name, log file name for notifications (sending emails, etc)
 	std::string log_file, log_notify_file;