Reduce redundancy in alias

[Frank Benoit]

I use aliases in many case to import a symbol from somewhere into the 
current scope. The identifier remains the same.

For example, alias to override

class D : B {
   alias B.foo foo;
   void foo( long a ){}
}

Or i want to make constant values available from somewhere else
import WINTYPES = tango.sys.win32.types;
class OS {
   alias WINTYPES.WS_TABSTOP WS_TABSTOP;
   // 2000 more
}

I think, it would be really handy, if i could simply write
alias B.foo;

So the rule would be
"If a FQN is aliased without an alias symbol name, the last part of the 
FQN is taken as the alias symbol name."