-Delinked the arc-cosine function from numpy but using the math module... -Re-introduced try/except pattern to provide alternative import if numpy is not  available -
-Delinked the arc-cosine function from numpy but using the math module...
-Re-introduced try/except pattern to provide alternative import if numpy is not
 available
-

jamiebull1/eppy,jamiebull1/eppy,santoshphilip/eppy,santoshphilip/eppy,santoshphilip/eppy,jamiebull1/eppy,eayoungs/eppy,eayoungs/eppy,eayoungs/eppy