Update HARKmanual.tex (#64)
Update HARKmanual.tex (#64)

I modified some. Please check it:

1. I think the simple description of CRRAutility is needed; 
2. add the definition of attributes
3. Examples in chapter 3.4 were not working because Nagents were missing both in MyConsumer and OtherConsumer; now fixed.
bolmez/Class-HARK,econ-ark/HARK,econ-ark/HARK,mnwhite/HARK