lib-plugins does not check custom_registration config option where required

[eSilverStrike]

I had to add checks for PLG_createUser (and I did for PLG_deleteUser) as it did not check the config option for

$_CONF['custom_registration']

Because of this the custom create user function was being executed for every new user. Not sure if checks need to be added for anymore custom user functions. Need to double check

[eSilverStrike]

Just added the check for custom_user_change in function PLG_userInfoChanged

Don't think I need to do this for CUSTOM_user_login in function PLG_loginUser (and for logging out) as not part of creating custom user.

Thoughts on any other functions that should check the custom_registration first?