commit various generations of changes, updates, fixes.  start tracking.
fix table name I broke.
update mode syntax to new mapnik
slightly optimise the low zoom level forest query
optimise the admin_level=4 queries to the db slightly
fix oneway arrows, perhaps related to mapnik version change

Apparently if you wanted a oneway arrow you didn' tneed to specify the
marker's icon file path before because that was the default icon for
markersymbolizer, now a different one is default.
icon updates from Zibi (?)
reorganise highway shield related rules a bit to fix empty shields.
Set the new source db.
Add missing ST_ prefixes, now required by Postgis 2
Outline colour changes by pbabik (?)
Restore trails in default layer now that offsets work.
budynki: Uppercase keywords, more geometry error proofing.
budynki: Support building:part, optimize for speed, more formatting changes.

Also as a side effect of the optimisations there's a tiny visual
difference in that same-level adjacent rooves have no dividing lines
anymore - may easily be fixable if actually desired...
copy_tracks: Analyze planet_osm_line to improve query speed.
Mapnik-3 optimisations (commented out)
Drop hardcoded absolute paths to shape&tiff files.
osm2pgsql.style: Drop hikebike support and unused columns.

Optimize import time by dropping unused columns as well as the
columns that were only in use by our no-hstore version of Colin
Marquadt's hike&bike map style.
szlaki: Reduce labels min-distance, reformat.
contour: Colour and opacity changes.

Probably done by Michal Mackiewicz in 2012/2013 -- can't tell because
history and authorship weren't tracked.