Sync version.
Multiple changes:

- get rid of has_history everywhere;
- split "procedures" into "pre-procedures" and "post-procedures":
	- pre-procedures are created before tables
	- post-procedures are created after tables
- add is_network(inet) procedure;
- fix ipblock_parent() to use iprange() from ip4r.
Cosmetic change: add vim modeline to all modules.
A different way to manipulate an order of procedure creation.
Add functional indexes on Ipblock, including spatial (gist) index on addr.