class/Module: Minor indent fix
func/config: New func SetCfgDefault()

'config.php' should run before 'config.default.php', the good is:

1.	User can define CONSTANT free, just need add check in config.default
2.	In config.default, there may re-use value defined in config
Data save
New class Rv
class/Cache: Fix auto splitted value combine error

After combine string read from memcached server, it need to be surround
by '"', to be a valid JSON string.
func/string: Fix ' ' in <br /> been replaced by &nbsp;
class/Cache: Add Ver() method for batch delete