[survey] Add support for configurable ranges

The ranges for the survey station can be configured on a per-part basis
using the SiteRanges field in the module node. This is just a list of
comma-separated ranges in meters. 0 or negative ranges use the default
range, missing elements (ie, too few in the list) use the default value
for those ranges, excess ranges are ignored, and any parsing error
aborts the list leaving unprocessed ranges at their default value.

Closes #179

Source/Survey/SurveySkill.cs

@@ -46,7 +46,7 @@ protected override string GetDescription ()
 			int exp = Parent.CrewMemberExperienceLevel (6);
 			return String.Format ("{0} can use survey sites out to {1}m.",
 								  pronoun,
-								  ELSurveyStation.site_ranges[exp + 2]);
+								  ELSurveyStation.default_site_ranges[exp + 2]);
 		}
 
 		public int GetValue ()

Source/Survey/SurveyStation.cs

@@ -43,9 +43,12 @@ public class ELSurveyStation : PartModule, IModuleInfo, IPartMassModifier, ELBui
 		double craft_mass;
 		[KSPField (guiName = "Range", guiActive = true)]
 		float range = 20;
-		public static float[] site_ranges = {
+
+		public static float[] default_site_ranges = {
 			20, 50, 100, 200, 400, 800, 1600, 2000
 		};
+		[KSPField] public string SiteRanges;
+		public float[] site_ranges;
 
 		public override string GetInfo ()
 		{
@@ -239,7 +242,7 @@ public Transform PlaceShip (Transform shipTransform, Box vessel_bounds)
 			xform.transform.rotation = points.GetOrientation ();
 			Debug.Log ($"[EL SurveyStation] launchPos {xform.position} {xform.rotation}");
 
-			Vector3 shift = shipTransform.position;
+			Vector3 shift = shipTransform.position + new Vector3(0, 5, 0);
 			shift += points.ShiftBounds (xform, shift, vessel_bounds);
 
 			relativeRotaion = shipTransform.rotation;
@@ -293,6 +296,9 @@ public override void OnLoad (ConfigNode node)
 		public override void OnAwake ()
 		{
 			control = new ELBuildControl (this);
+
+			site_ranges = new float[default_site_ranges.Length];
+			Array.Copy (default_site_ranges, site_ranges, site_ranges.Length);
 		}
 
 		public override void OnStart (PartModule.StartState state)
@@ -301,6 +307,27 @@ public override void OnStart (PartModule.StartState state)
 				|| state == PartModule.StartState.Editor) {
 				return;
 			}
+
+			if (!String.IsNullOrEmpty (SiteRanges)) {
+				string[] ranges = ParseExtensions.ParseArray (SiteRanges);
+				if (ranges != null) {
+					for (int i = 0; i < ranges.Length && i < site_ranges.Length; i++) {
+						float v;
+						if (!float.TryParse (ranges[i], out v)) {
+							Debug.Log ($"[EL SurveyStation] error parsing site ranges: {ranges[i]}");
+							break;
+						}
+						if (v <= 0) {
+							// treat as default
+							continue;
+						}
+						site_ranges[i] = v;
+					}
+				}
+			}
+			//for (int i = 0; i < site_ranges.Length; i++) {
+			//	Debug.Log ($"[EL SurveyStation] site_ranges[{i}]: {site_ranges[i]}");
+			//}
 			control.OnStart ();
 			if (EVARange > 0) {
 				EL_Utils.SetupEVAEvent (Events["ShowRenameUI"], EVARange);