(svn r6166) -Fix: [YAPF] fixes one very improbable assert when adding startup node that already exists in the open-list (thanks Panzerfather)

(svn r6165) -Feature: control click Goto Depot will now make the vehicle service
at the depot and leave right away.
To tell the difference the status of stopping vehicles will be in red,
while servicing vehicles will be green.
-Codechange: remove some dead code in CmdSendAircraftToHangar() since it is
conflicting with new functionality. Now p2 means the same for all types

(svn r6164) -Fix [YAPF]: Road vehicles preferring bends - added yapf.road_curve_penalty setting with default value 100 (=YAPF_TILE_LENGTH) that is saved only in MP games (mart3p)

(svn r6163) -Codechange: distance rounded up (correction of r6162)

(svn r6162) -Fix: Multistop problem caused by incorrect distance returned by YapfRoadVehDistanceToTile() (by mart3p)

(svn r6161) -Feature: List of vehicles with the same shared orders
the list is available in the orders window and looks like the list buttons from the station windows (small vehicle)
The button is disabled if the vehicle do not have any shared orders or it got shared orders, but an empty order list
based on a patch by nycom, thought it ended up getting heavily modified
Thanks to TrueLight for proofreading and suggestions

(svn r6160) -Fix [ 1519167 ] Bus trying to service in depot of other company (mart3p)
thanks Darkvater for hotfix (r5897)

(svn r6159) -Fix: FindClosestTrainDepot hardly ever found a depot with NPF off due to absence of distance-normalization (Rojer)

(svn r6158) -Revert r6139 as that breaks strings with cases. Thanks michi_cc

(svn r6157) -Codechange: DeleteVehicle removes a vehicle from the pool
-Codechange: DestroyVehicle is called by DeleteVehicle to remove all things where a vehicle depends on.
Last 2 changes to prepare for new pool system. Not pretty now, will be soon.