Expose version information

Profiles now have access to it.
Documentation updates
Ordering improvements in IP configuration

- Add static routes prior to setting the default IP4 gateway
  (github/pull/43)
- Set sysctl property net.ipv6.conf.<interface>.accept_ra earlier
  (FS#35788)
Fix default interface bindings (third time)

The declare builtin defaults to making variables local.

Previous attempts:
711c46457ae9fef52c7c529d89c67d0d526f73ef
e8210827fd59e4539a70af55cb452b211633fedd