Reworking import statements (proposal)

Hi,

As of now relative imports (ie importing from something already imported) 
look exactly the same as absolute ones (ie where we're importing using full 
paths), except when explicitly starting from _root_. That is both confusing 
(where I have relative or absolute import? it's not immediately obvious) 
and ugly (the _root_ prefix is ugly).

My proposal is to change import statements semantics to make things obvious:

Current state:
import _root_.outer.inner.Member - for absolute imports (usually used when 
there are name clashes)
import outer.inner.Member - for absolute imports (usually used when there 
are no name clashes)
import inner.Member - for relative imports
import parameter.member - for importing from parameters

Proposal for next Scala version:
import _root_.outer.inner.Member - deprecate _root_ prefix
import outer.inner.Member - leave as it is
import inner.Member - deprecate this form of relative imports
import _.inner.Member - introduce this syntax for relative imports
import parameter.member - leave as it is

And a version after that:
import _root_.outer.inner.Member - drop support for _root_prefix
import outer.inner.Member - keep it
import inner.Member - drop support for this form of relative imports
import _.inner.Member - keep it
import parameter.member - keep it

What do you think about it?

Regards,
Piotr Tarsa

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