Mode standalone: Bugfix, use x/y/z instead of x/y/zoom
Mode standalone: bugfix, convert geometries to result srs
Converting geometries to result srs: try to reduce amount of conversions
Compile Link Selector: Bugfix when parent conditions can't be compiled
Main: fix database type list, add reference to documentation

- closes #90
Main loop: add all config options as replacement patterns
DB/*: add option to set search_path
Merge pull request #91 from plepe/search_path

DB/*: add option to set search_path
DB/*: add option db.hstore_key_index
Externals: Update MAKI icons
Update to version 0.9.1
Merge tag 'v0.9.1' into branch-0.10

Conflicts:
	pgmapcss/compiler/compile_sql.py
	pgmapcss/version.py
Compile Link Selector: Bugfix, no child conditions compiled
DB/Overpass: Bugfix compiling non-evaluating set statements

- if a condition for a class has no statements which set this class, it
  always evaluates to False (before, this would always be True for db
  select statements)
DB backend, improve & doc: start documenting + think about standardization
DB backend, improve & doc: improve new documentation
DB backend, improve & doc: reduce parameters on compile_selector()
DB backend, improve & doc: move handling of set statements to compile_db_selects()
DB backend, improve & doc: redesign

- redesign representation of parent selectors
- db.compile_selector() does not accept 'statement', but 'selector'
  instead
- remove unnecessary function arguments
DB backend, improve & doc: re-design db.merge_conditions()

- db.merge_conditions() is called separately for each object type -
  object type is no longer passed, only list of conditions