Merge pull request #391 from jgray-19/survey_fixes

Thin Survey Fix

Author: ldeniau

src/madl_esurv.mad

@@ -229,7 +229,7 @@ local function track_thin (elm, m)
   m.el, m.ang = 0, angle*m.tdir
 
   local kick = abs(angle) >= minang and curex_thin or fnil
-  trackelm(elm, m, thinonly, kick)
+  trackelm(elm, m, thinonly, kick, nil, fnil)
 end
 
 local function track_thick (elm, m, fng_)