objects_osm2pgsql: new fun objects_relation_member_of()
objects_osm2pgsql: fix objects_relation_member_of() by introducing objects_relation()
Link Selector: Accept 'in' for relation members
objects_osm2pgsql_relation_member_of(): speed-up by returning null-geometry
Eval::parent_tag(): new function
Eval: new list functions unique() and sort()
test.mapcss: Print route refs on each tram track
Eval: new function natsort()
objects_osm2pgsql::objects_relation_member_of(): 'sequence_id' instead of 'index'
Link Selectors: adhere link conditions
pgmapcss_compile_link_selector(): compile link selector 'in' and default (empty list)
Eval::link_tag(): new function
Link Selector 'near'
Documentation: link selectors
pgmapcss_parse_selector_part(): pass possible object classes as regexp
Link selectors: change 'in' to '>'
Documentation::MapCSS: Link selector '>', note about distance condition
Link Selector '<' relation members
Example 4: tramway route network
style_id_check() no longer returns all columns -> moved to style_id_match()