Improve comments on layout diagrams in cityrules.tab
Eliminate "not on road" house building (it's not pretty).  Increase chance of houses near stations.  Make road rule to fill in gaps behind factories/city halls/monuments.
cityrules.tab: Add something to fill in on long roads backed by water (etc).  Add diagonal link for "mismatching" road extensions.  Revise "filling in" rules.  This seems to work!
Tweak the minimum time tolerances upwards, to make more passengers satisfiable (at least theoretically!)
Add bridge_success_percentage.  Lower minimum_building_density (interim fix pending code rewrites).  Raise renovation_percentage a little to make up for it...
Lower renovation_percentage again to get more sprawl.
Slightly improve "filling in holes" rule
As an experimental, raise renovation_percentage and lower minimum_building_density further.
Reduce the chance of houses on a diagonal road (unless it already has a straight road coming out)
Turn down the bridge_success_percentage.
Merge branch 'ncn-devel' of http://github.com/neroden/simutrans-pak128.britain.git