Correct sorting example for Ordering in scaladoc

	Below code snippet,
    Sorting.quickSort(pairs)(Ordering.by[(String, Int, Int), Int](_._2)

    should be
    Sorting.quickSort(pairs)(Ordering.by[(String, Int, Int), Int](_._2))
SI-6793 Don't use super param accessors if inaccessible.

"Alias replacement" has been with us since 2005 (13c59adf9).

Given:

    package a {
      class C1(val v0: String)
      class C2(v1: String) extends a.C1(v1) { v1 }
    }

The reference to `v1` is rewritten as `C2.super.v0()`, and
no field is generated in `C2`.

(Oddly, this optimization doesn't seem to kick in if
these classes are in the empty package. That's probably
a distinct bug.)

However, this rewriting is done without consideration of
the accessibility of `v0` from `C2`.

This commit disables this optimization if there if `v0` is
not accessible.
Scaladoc: Load scripts at the bottom, and with a defer attribute

To improve latency on modern browsers (which supports defer) and old browsers:

 * https://www.webkit.org/blog/1395/running-scripts-in-webkit/
 * http://developer.yahoo.com/blogs/ydn/posts/2007/07/high_performanc_5/
Use java-diff-utils for diffing in partest.

We now use the unified diff format, hence the updated check files.

It's not clear to me how partest's classpath is managed,
but the approach in this commit works for the ant task and script invocation.
The diffutils jar is injected in the parent classloader.
Strip version suffix from diffutils.
Merge pull request #2330 from adriaanm/partest-difftools

Use java-diff-utils for diffing in partest.
Merge pull request #2321 from kzys/js-defer

Scaladoc: Load scripts at the bottom, and with a defer attribute
get rid of args element in staged-scalac
SI-7147 Diagnostic for unexplained assertion in presentation compiler.

We don't have a reproducible test for this, so the best we can
do is beef up the assertion to shine a little light on the problem.
Regularity for build.xml: 1 output dir / project

Untangle actors, msil builds from library/compiler builds.
For further regularity, always build java files.

TODO: update IDE projects
Preliminary support for zinc.

To use Zinc with the ant build:
  - install zinc and symlink the installed zinc script to ${basedir}/tools/zinc
    (${basedir} is where build.xml and the rest of your checkout resides)
  - make sure to set ZINC_OPTS to match ANT_OPTS!
  - invoke ant as `ant -Dstarr.version="2.10.1" -Dlocker.skip=1`
    (zinc does not work if locker is only classfiles, needs jars
     TODO rework the build to pack locker and build using that when using zinc?)

Mostly to enable dog fooding of incremental compilation work for now.
formatting
Merge pull request #2303 from starblood/gyuhang/libdoc

Correct sorting example for Ordering in scaladoc
Backport #2289's TermNames.unexpandedName as TermNames.originalName

Because this implementation is more clear than 2.10.x's and it will
simplify a further commit to fix SI-6715.
SI-6715 Shouldn't return "" from TermNames.originalName
Merge pull request #2281 from kzys/jira-6715

SI-6715 Scaladoc: Use an encoded name if a decoded name is ""
Merge pull request #2319 from retronym/ticket/6793

SI-6793 Don't use super param accessors if inaccessible.
Add a cautionary comment to TreeSymSubstitutor.
Refactor existential related code out of types.

For imminent reuse in the subsequent commit.

The binary compatibility whitelist is updated to
ignore these, as they live in reflect.internal.
Simplify interplay between Uncurry Info- and Tree-Transformers

Now, the InfoTransformer is responsible for erasing the
path dependent types of formal parameters, at the same
place where it flattens nested method types.

This is preferable to having the tree transformer overwrite
the result of the info transformer, as used to be the case
after my previous work on SI-6135 / 493197fc.