untested POST version of stroke_data API

rowers/dataprep.py

@@ -84,6 +84,14 @@ def rdata(file,rower=rrower()):
 
     return res
 
+def testdata(time,distance,pace,spm):
+    t1 = np.issubdtype(time,np.number)
+    t2 = np.issubdtype(distance,np.number)
+    t3 = np.issubdtype(pace,np.number)
+    t4 = np.issubdtype(spm,np.number)
+
+    return t1 and t2 and t3 and t4
+
 def getrowdata_db(id=0):
     data = read_df_sql(id)
     data['pace'] = data['pace']/1.0e6