Compilation warning in debug.cpp

When compiling debug.cpp on a 32-bit Windows system we get the warning:
```
...\doxygen\src\debug.cpp(121): warning C4244: 'return': conversion from '_Rep' to 'int', possible loss of data
        with
        [
            _Rep=__int64
        ]
```

as we only use the seconds representation of the elapsed time we can do the conversion to seconds in the Timer class.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/debug.h b/src/debug.h
index 0c046f4..edc95e2 100644
--- a/src/debug.h
+++ b/src/debug.h
@@ -47,7 +47,7 @@ class Debug
     static void setPriority(int p);
 
     static void startTimer();
-    static int  elapsedTime();
+    static double elapsedTime();
 
   private:
     static DebugMask curMask;