Added a heuristic to the inliner.

But it's commented out because I want to get this logging
code into 2.10 without including anything "interesting".
Worked around SI-6161 by annotating abstract type.
Took measures to quiet down specialization logging.

While hopefully still hearing about certain things (like symbol renames)
when it's not a specialized symbol.
Large logging cleanup effort.

Quieted down many logging statements which contribute
disproportionate noise.  Made others emit something more sensible.
Spent lots of time on the inliner trying to find a regular
format to make the logs more readable.  Long way to go here but
it'd be so worth it to have readable logs instead of mind-numbing
indiscriminate text dumps.
SI-6335 More precise location of the implicit class synthetic method.

One approach would be to disallow an implicit class in a template
that already has a member with the same name.

But this commit doesn't do this; instead it uses `isSynthetic` to
find the synthesized implicit conversion method from the potentially
overloaded alternatives.
More tests for SI-6335.
SI-6276 Warn on def or val that trivially loops infinitely
fix usage of Duration in Promise impl

- correctly treat MinusInf and Undefined
- don't toMillis in the timeout message (could be MinusInf)
- also notice that Inf did not actually wait unbounded
- and further notice that tryAwait swallows InterruptedException instead
  of bailing out early => changed to do so and added throws annotation
- also removed some unused imports of Duration
SI-6162 Adds @deprecatedInheritance/@deprecatedOverriding

These annotations are meant to warn from inheriting a class or
from overriding a member, due to the reasons given in `msg`.

The naming and placement of the methods is in line with
@deprecated and @deprecatedName.
Adds @deprecatedInheritance to BigInt and BigDecimal
Rescues @deprecated{Inheritance, Overriding}

While they ought to be generalized to aribirary modifier
changes before being offered in the standard library, the
opportunity to use them in 2.10 is too important to pass up.

So for now, they're private[scala].

En route:

 - made the error messages more concise
 - fix positioning of inheritance error
 - improve test coverage
Pull request feedback
Merge pull request #1275 from retronym/ticket/6276

SI-6276 Warn on def or val that trivially loops infinitely
Merge pull request #1284 from retronym/topic/deprecated-inheritance

SI-6162 Adds private[scala] @deprecatedInheritance/@deprecatedOverriding
Merge pull request #1274 from retronym/ticket/6335

SI-6335 More precise location of the implicit class synthetic method.
Merge branch '2.10.x' into topic/inliner-logging

Conflicts:
	src/compiler/scala/tools/nsc/backend/icode/GenICode.scala
Disable test t2868

it keeps failing randomly, e.g. http://scala-webapps.epfl.ch/artifacts/e3b0c7abbf637dacce7bcd7b69d5655820e8e714/buildLog.txt
improve docs and Promise impl

- scaladoc the exceptions thrown by Await.* and Awaitable.*
- move intercept[Exception] into partest’s TestUtil object
- improve Promise.tryAwait implementation following Viktor’s comments
  and make use of Deadline to avoid calling System.nanoTime too often
Merge pull request #1262 from jsuereth/fix/SI-6271

Fixes SI-6271 - Missing isEmpty override for views.
Merge pull request #1287 from lrytz/disable-t2868

Disable test t2868