Update configure.ac
interface: Fix allow building flag on eastern/southern lakesides.
Fix #34: Correctly determine whether a water path or land path is built.
Fix: Check before starting attack did not allow attack on any building.
Fix: Possbile crash in viewport.
serf: Refactor handler of FREE WALKING state.
Fix #58: Properly fetch resource type when flag is demolished.
Fix #59: Update map cursor after closing popup box.
Fix #56: Change geologist to LOST state if his flag is removed.
Properly save building state for burning building.
game, serf: Add various comments and remove some log messages.
Allow window to be resized dynamically.

sdl-video: Setup resizable window; reinitialize main surface clip.
interface: Allow interface component to be resized dynamically.
Change resolution on video resize event.
Allow switch to/from fullscreen (ctrl+f)
gui: Add function to containers that returns the relative position of a child.
interface: Fix #28, Allow locking events to a specific gui object
Fix #62: Building road along water does not correctly check validity of road.
Possibly fix delay/lag issue

Do handle all events!
This should fix https://github.com/jonls/freeserf/issues/50
Merge pull request #75 from genodeftest/master

Fix bug where only one event is processed per frame.
This fix seems to provide more responsiveness for the interface and may be enough to mitigate #71 and #50.
Fix #27: Handling non-square maps.
Fix #74: Don't show demolish button in interface for enemy buildings