Mode standalone: when using z/x/y urls, either accept z= or zoom=
DB/Osmosis: remove profiling -> has been moved to main loop
DB/Osmosis: debug add_column queries (e.g. for near conditions)
DB/Osmosis: support for hide_outer_ways column (osmosis-multipolygon v0.3)
Doc: checklist for version upgrade
Bump to version 0.9.2
Merge branch 'master' into branch-0.10

Conflicts:
	doc/database.md
	pgmapcss/db/osmosis/db_functions.py
	pgmapcss/version.py