Added new tab Entity Statistics to dobexplorer.

Conflicts:
	src/dose/dose_dobexplorer.ss/src/dosemon.cpp
	src/dose/dose_dobexplorer.ss/src/dosemon.ui
	src/dose/dose_dobexplorer.ss/src/entitystats.cpp
	src/dose/dose_dobexplorer.ss/src/entitystats.h
	src/dose/dose_dobexplorer.ss/src/memgraph.cpp
	src/dose/dose_dobexplorer.ss/src/memgraph.ui
Added discription of Entity Statistics in the About tab.