add frappy_psi/calcurve.py and calibtest.py

Change-Id: I5b9aae0ac3bcd76d846c08717201e6c32df4b675

calibtest.py

@@ -0,0 +1,22 @@
+import sys
+import os
+from glob import glob
+from frappy_psi.calcurve import CalCurve
+
+os.chdir('/Users/zolliker/gitpsi/calcurves')
+
+if len(sys.argv) > 1:
+    calib = sys.argv[1]
+    c = CalCurve(calib)
+else:
+    for file in sorted(glob('*.*')):
+        if file.endswith('.md') or file.endswith('.std'):
+            continue
+        try:
+            c = CalCurve(file)
+            xy = c.export()
+            print('%9.4g %12.7g %9.4g %9.4g %s' % (tuple(c.extx) + tuple(c.exty) + (file,)))
+        except Exception as e:
+            print(file, e)
+            calib = file
+