bugfix: srtmconf tests, for some strange reason default values malfunct.

this appeared on travis when multiple images seemed to share the conf
state (this cannot really be the case, can it?); however, only one
of the images would succeed with the tests, all others started with
wrong config???

pycraf/pathprof/tests/test_srtm.py

@@ -16,6 +16,15 @@
 
 class TestSrtmConf:
 
+    def setup(self):
+
+        srtm.SrtmConf.set(
+            srtm_dir=os.environ.get('SRTMDATA', '.'),
+            download='never',
+            server='nasa_v2.1',
+            interp='linear',
+            )
+
     def test_context_manager(self):
 
         srtm_dir = srtm.SrtmConf.srtm_dir