- added an example on how to update values in a hash table
- fixed a problem in subgraph.cpp:GetEgonet() which could fail for graphs with bidirectional connections
- minor comment update
- fixed an incorrect method reference in AttrValueEI()
implemented a complete set of methods GetIntAttrIndDatN(), GetStrAttrIndDatN(), GetFltAttrIndDatN(), GetAttrIndN(), GetAttrIndE(), fixed NodeId to NodeI for iterators
- implemented GetIntAttrIndDatE(), GetFtlAttrIndDatE(), GetStrAttrIndDatE()
- implemented IsAttrDeletedN(), IsIntAttrDeletedN(), IsFltAttrDeletedN(), IsStrAttrDeletedN(), IsAttrDeletedE(), IsIntAttrDeletedE(), IsFltAttrDeletedE(), IsStrAttrDeletedE()
Merge remote-tracking branch 'upstream/master'

Conflicts:
	snap-core/network.h