change to Duration class, allow float in sec variable

Author: TestPerson-BAR

src/compas_fab/robots/time_.py

@@ -19,8 +19,11 @@ class Duration(object):
     """
 
     def __init__(self, secs, nsecs):
-        self.secs = int(secs)
-        self.nsecs = int(nsecs)
+        sec_to_nano_factor = 1e9
+        quotient, remainder = divmod(secs, 1)
+
+        self.secs = int(quotient)
+        self.nsecs = int(remainder*sec_to_nano_factor) + int(nsecs)
 
     def __str__(self):
         return 'Duration({!r}, {!r})'.format(self.secs, self.nsecs)