Plot management fixes (#1735)

* Plot management fixes

This hopefully adds a few more items to the maintain list (@icomrade)
Uses epoch_returnChange to accurately and tidily return change and
handle money.
Localize maintain_area.sqf for single currency servers

* Plot Management tidyness

Fixing tidy issues

* Plot management changes

Fix maintenance variables as per @ebaydayz

* Plot management

Missed one

* Plot management fixes and default maintain_area fixes.

Convert original maintain_area.sqf to epoch_returnChange, I used the
plot management localization strings since I liked them better, the
epoch ones don't make a lot of sense really. Makes no difference if plot
management is turned off anyway.
Change the single currency version to work a lot better than it did, I
put the cost per item to 100 to be more in line with what I would expect
on a server

Changed _range to use DZE_maintainRange (DZE_plotPole select 0 + 20)

SQF/dayz_code/actions/plotManagement/plotGetFriends.sqf

@@ -6,7 +6,4 @@ _thePlot = _plots select 0;
 _friendlies =  _thePlot getVariable ["plotfriends", []];
 {
 	lbAdd [7002, toString (_x select 1)];
-} forEach _friendlies; // count causes Error Type Number, expected Bool here
-
-
-
+} forEach _friendlies;