NLog.l() now has clickable log-entries.
Added NLog.isDebugEnabled() to get debug-state. This is f.x. used in
NMapFragment.getInstance()'s catch like this:
if(NLog.isDebugEnabled())
	e.printStackTrace();
because it can be relevant to get the whole stack trace in stead of
using NLog.e() which only prints one line.

Added NBaseMapFragment, but the code is commented out atm., since it is
not complete, and not working yet.