Change defaults so that we can use xapian-omega in a chroot without a
configuration file.

Index: configfile.cc
--- configfile.cc.orig
+++ configfile.cc
@@ -38,12 +38,12 @@ static const char configfile_local[] = "omega.conf";
 static const char configfile_system[] = CONFIGFILE_SYSTEM;
 static const char configfile_envvar[] = "OMEGA_CONFIG_FILE";
 
-string database_dir = "/var/lib/omega/data/";
-string template_dir = "/var/lib/omega/templates/";
+string database_dir = "/var/omega/data/";
+string template_dir = "/var/omega/templates/";
 string default_template = "query";
 string default_db = "default";
 string log_dir = "/var/log/omega/";
-string cdb_dir = "/var/lib/omega/cdb/";
+string cdb_dir = "/var/omega/cdb/";
 
 /** Return true if the file fname exists.
  */
