Allow specifying debug path through the environment.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>

lib/newfol/main.py

@@ -28,8 +28,12 @@ logfd = None
 
 def log(*args):
     global logfd
+    try:
+        path = os.environ['NEWFOL_DEBUG']
+    except:
+        return
     if logfd is None:
-        logfd = open(os.path.expanduser('~/newfol_debug.log'), "w")
+        logfd = open(path, "w")
     logfd.write(" ".join(*args))
     logfd.flush()