if PQstatus(conn) == CONNECTION_BAD attempt to create a new one + expose "conect_timeout" PG connection parameter default to 4 sec + throw mapnik::datasource exception if connection is 'bad' in mapnik::features(..)
… xml will be written to.
…r, moved to src/agg in r1929
+ move agg_renderer.cpp to src/agg
…ke no_skip with boost 1.42
…nt in addition to local/feature (default) alignment - closes #203
…dal plugin (with or without overviews)
…image scaling modes which demand high quality resampling - bilinear requires 2x, others in future like lanzcos may require 3-4x - addresses #563