Joshua M. Thompson

MapWidget: fix a crash on uninitialized.

Add pkg-config macros to acinclude.m4, so configure script is generated correctly even if pkg-config is not installed / is installed in a strange location.

Route-file saving.

Support loading plain-text routes, and stop aggressively using the cruise altitude when loading waypoints.

bug99 - Fix case where damping is enabled, but factor is 0.

Candidate fix for bug #118, crash with custom (scenery) airport data.

Bug #99 - change viewer damping calculation, to work correctly regardless of set/recalc/update ordering per frame.

GPS/route-manager - notify listeners when current waypoint is changed.