New developement snapshot.

So current version of therion should support centerline with LRUD in map editor. As usually - it is implemented easiest way for programmer :) with minimal changes in current interface. So how it works: 1. Therion supports new map format export - xvi (xtherion vector image). 2. XTherion can load xvi images into backgroud, as any other bitmap image. There are some special bindings for vector images - e.g. if you insert point on station, type and station name are automatically set. When exporting xvi images - they are exported in 100dpi in layout-scale. Grid spacing is also taken from layout X grid-size. Waiting for feedback and comments :) S.