Fix strideBack for ref ranges.
Added tests for reference type ranges to stride.
Fix for issue# 9456.

This change makes it so that decodeFront takes its range by ref and pops
off the code units that it decodes (unlike decode). It pretty much has
to do that, since it supports input ranges, and they can't do anything
else.
Swap a couple of overloads in std.utf.

This makes no semantic difference to the code, but it makes it so that
the attributes which are on one of the overloads don't make it into the
documentation (where they would imply that all of the overloads have
those attributes, which is not correct).
Minor tweak to decodeFront per review.
Fix `std.traits.hasElaborate*` docs for static arrays.
Document compiler-generated `opAssign` for `std.traits.hasElaborateAssign`.

* also add unittests
Merge pull request #1129 from jmdavis/decode

Fix Issue 9456 -  decodeFront is inconsistent in whether it pops elements off of the range or not
Merge pull request #1260 from denis-sh/fix-std.traits.hasElaborate-docs

Fix `std.traits.hasElaborate*` docs
Make std.stdio.File 'package' accessible

This is required in the new std.process.
StdioException: No system error msg when errno==0
Renamed File.isPipe to isPopened

Now that std.process will support pipe creation, the name isPipe will
only cause confusion, as it will in fact be false for "normal" anonymous
pipes.  It is only true for files opened by popen(), and its purpose is
simply to ensure they are closed with pclose().
std.process redesigned

This is a complete redesign of std.process. It has passed the community
review and is now ready for inclusion in Phobos master.

Review and vote:
http://forum.dlang.org/thread/gclsbrghhjitnfderoos@forum.dlang.org
http://forum.dlang.org/thread/mgstnugckomjpvdgpudz@forum.dlang.org
Deprecate xformat and xsformat.

They were intended to be temporary, and now format and sformat use their
exact implementations and have for 6 months (though for some reason, xformat
and xsformat weren't turned into aliases when that happened, which I fixed
in this commit as well).
Undocument some deprecated functions.

They were marked for removal in the docs (many of them were intended to
be removed in January), so now they've been removed from the docs and
marked for removal from the code in November.
Removed some undocumented, deprecated functions from std.algorithm.

They were scheduled to be removed in January 2013 but weren't, so
they've been around as undocumented, and deprecated for a while now.
Merge pull request #1285 from jmdavis/deprecated

Move some deprecations along
Merge pull request #1272 from kyllingstad/std-process

std.process redesigned and reviewed
xformat -> format
Merge pull request #1286 from NilsBossung/xformat

remove the last traces of xformat