updated syntax for method references

[Maurizio Cimadamore]

Hi,
I recently pushed a changeset to remove support for '#'-based syntax for 
_method references_ (the commit message is confusing, I pushed too fast 
;-)). This means that the long standing syntax for method references:

Foo#bar
new Foo()#bar
super#bar

is now not supported anymore. Instead, the compiler accepts a similar 
infix variant, where '#' is replaced by '::' - this has been available 
for quite some time, and it is also the syntax used in all recent 
documentation:

Foo::bar
new Foo()::bar
super::bar

The syntax discussion regarding method references is still ongoing with 
the EG - so this push doesn't mean we are 100% committed to the '::' 
syntax - on the other hand we are fully committed _not to_ have the '#' 
syntax, as we envisage better usages for such token in future releases.

Maurizio