#824 Classify enzymes

[James A. Overton]

These proteins should classify under 'enzyme':

deoxyribonuclease-1
nuclease S1
double-stranded RNA-specific adenosine deaminase
ribonuclease CL3
guanyl-specific ribonuclease T1
ribonuclease T2
ribonuclease U2
ribonuclease V1

We can do this by asserting that each is a subclass of 'has function' some 'catalytic activity'.