makes it more convenient to work with SuppressMacroExpansionAttachment
SI-7265 General test for spec version

The test for isJavaAtLeast uses the specification.version.

The method argument must have the form "major.minor".

The scaladoc is updated to reflect the new reality and a
test is added under junit.

Note that this implementation aims to be a simple
compromise between the functional and imperative camps,
that is, to be free of both closures and while loops.
And to elicit no cruft like regexes and wrappers for strings.
No doubt even more could be done in this department, but we
don't wish to spoil the fun on codegolf.stackexchange.com.
However, we might decide to sponsor a new site:
codereviewpingpong.com

For 2.10.x, javaSpecVersion is provided as a private member.
The active test is under `run` and the `junit` test must
bide its time in `pending`.

For 2.11, the private members can be public and the app test
replaced with the unit test.
SI-7336 - Link flatMapped promises to avoid memory leaks
SI-7638 Superaccessor lookup after specialization

The crash was caused by a symbol lookup to rewire the super calls,
done after pickler, but specialization added new traits and new
members, thus making the super rewiring impossible. To avoid such
problems, this patch moves symbol lookup after specialization,
so the changes done by specialization (and miniboxing) become
visible to mixin.

NOTE: This patch will be followed by a similar patch to master.

Review by @adriaanm or @retronym.
fix typo in BigInt/BigDecimal deprecation messages
SI-7617 typedAssign no longer expands lhs

This makes sure that setter and updateDynamic macros work as intended
rather than in some cases expanding incorrectly or prematurely.

Setter invocations are desugared from assignments of values to getters.
If a typecheck of an assignment's lhs yields an invocation of a getter,
then the assignment is rewritten into an invocation of a setter. However
if a getter is a macro, then it just expands, destroying the prerequisite
for desugaring. Therefore we need to disable expansion for the typecheck
of an lhs.

Similar thing happens to updateDynamic that first desugars a getter
invocation into q"$target.updateDynamic($fieldName)" and then expects
typedAssign to rewrite the corresponding Assign node into an additional
application of a partially applied updateDynamic to a rhs. Here we also
need to disable the typecheck of an lhs, because macros cannot be
partially applied.
SI-7649 Fix positions for reshaped tag materializers

Calls to `materializeClassTag[T]` are replaced during reification with
`implicitly[ClassTag[T]]` in the `reify` macro. This is done to avoid
referring to symbols in scala-compiler.jar. Class- and Type-Tag
materialization is treated in the same way.

This commit positions the replacement trees to avoid triggering
assertions under -Yrangepos.
Merge pull request #2712 from VladUreche/issue/7638

SI-7638 Superaccessor lookup after specialization
Merge pull request #2689 from scalamacros/ticket/7617

 SI-7617 typedAssign no longer expands lhs
Merge pull request #2716 from SethTisue/terribly-important-typo-fix

fix typo in BigInt/BigDecimal deprecation messages
Merge pull request #2721 from retronym/ticket/7649

SI-7649 Fix positions for reshaped tag materializers
Merge pull request #2666 from som-snytt/issue/7265-spec-at-least

SI-7265 General test for spec version
Merge pull request #2674 from richdougherty/2.10.x-si7336-try2

SI-7336 Link flatMapped promises to avoid memory leaks