Updated documentation of how to add new native functions.

Small cleanups


Docs/manual.texi:
  Updated how to add new native functions
mysql-test/r/func_crypt.result:
  Fix for crypt on FreeBSD
mysql-test/t/func_crypt.test:
  Fix for crypt on FreeBSD
mysys/thr_lock.c:
  Changed to use statistics_increment macro for statistic variables.
BitKeeper/etc/logging_ok:
  Logging to logging@openlogging.org accepted

mysql-test/r/func_crypt.result

@@ -1,2 +1,2 @@
-encrypt('foo', 'ff')
-ffTU0fyIP09Z.
+length(encrypt('foo', 'ff')) <> 0
+1

mysql-test/t/func_crypt.test

@@ -1 +1,2 @@
-select encrypt('foo', 'ff');
+
+select length(encrypt('foo', 'ff')) <> 0;