Add more doxygen comments for reader.h
Add more doxygen comments for reader.h

Closes #147, closes #148, closes #149, closes #152.

BruceForstall/llilc,russellhadley/llilc,mmitche/llilc,tempbottle/llilc,tempbottle/llilc,JosephTremoulet/llilc,manu-silicon/llilc,erozenfeld/llilc,mmitche/llilc,richardlford/llilc,russellhadley/llilc,libengu/llilc,libengu/llilc,erozenfeld/llilc,kyulee1/llilcjit,swaroop-sridhar/llilc,AndyAyersMS/llilc,mmitche/llilc,AndyAyersMS/llilc,russellhadley/llilc-original,dotnet/llilc,manu-silicon/llilc,dotnet/llilc,adiaaida/llilc,russellhadley/llilc,erozenfeld/llilc,russellhadley/llilc-original,pgavlin/llilc,richardlford/llilc,dkorolev/llilc,BruceForstall/llilc,marksantos/llilc,libengu/llilc,JosephTremoulet/llilc,AndyAyersMS/llilc,dotnet/llilc,adiaaida/llilc,erozenfeld/llilc,libengu/llilc,JosephTremoulet/llilc,kyulee1/llilcjit,marksantos/llilc,tempbottle/llilc,russellhadley/llilc-original,pgavlin/llilc,marksantos/llilc,pgavlin/llilc,kyulee1/llilcjit,swaroop-sridhar/llilc,adiaaida/llilc,richardlford/llilc,manu-silicon/llilc,russellhadley/llilc-original,swaroop-sridhar/llilc,mmitche/llilc,BruceForstall/llilc,dkorolev/llilc,dkorolev/llilc