Add option to push stuck planes

Also changed flip vehicle back to 1051 default which allowed players to
flip non-ATVs with help.

SQF/dayz_code/init/variables.sqf

@@ -176,6 +176,7 @@ dayz_resetSelfActions = {
 	s_build_Wire_cat1 = -1;
 	s_player_deleteBuild = -1;
 	s_player_flipveh = -1;
+	s_player_pushPlane = -1;
 	s_player_stats = -1;
 	s_player_sleep = -1;
 	s_player_fillfuel210 = -1;