Auto create member page upon s2Member user registration.

This is a s2Member mu-plugin.

Based on code from here:

https://www.s2member.com/forums/topic/updating-page-meta-data/

And here:

https://wordpress.org/support/topic/update-posta-meta

Auto create user page on user registration:

1. Set page parent
2. Set page template
3. Set s2Member Level access
4. Set s2Member Ccap
5. Set page author as administrator