N3624 Editorial Fixes

In the new paragraph at the end of [expr], the reference to
"expr.qual" was fixed to refer to "conv.qual".

operator== and operator!= in body text were changed to "the ==
operator" and "the != operator" respectively. This makes it clear
that we are not talking about overloaded operators here.
N3638 Editorial Fix

Replaced dangling non-normative sentence referring to
[dcl.spec.auto] from [dcl.type.simple] with a non-normative note to
make the paragraph easier to read.
N3649 Editorial Fixes

Removed code font from "const" and "inline" in sentence usage, e.g. in
"For a generic lambda, the closure type has a public inline function".

An editorial issue was opened to make this consistent throughout the
draft.
N3638 Editorial fix

Avoided sentence starting with a conjunction ("But once a return ...")
and instead use "..., however, ...".

Removed single quotation marks from "instantiates both 'f's".
N3652 Editorial Fix

In [class.copy]/26 replaced "copy/move each direct base class" with
"copy/move each direct base class subobject" to make wording
consistent with other section above, as suggested by CWG chair.
Various bug fixes to application of wording.

N3624 - format U1 and U2 with code font

N3638 - add missing \pnum

N3649 - decl-specifierss -> decl-specifiers

N3652 - strike "of literal type" as directed by N3652.

Bugfix - remove spurious line break in [basic.start.init]/2.

Bugfix - remove excess whitespace in [expr.prim.lambda]

Bug fix - [expr.prim.lambda] format operator()(a) in code font.

Bug fix - in [expr.const] format constexpr in comment as code.

N3638 - remove spurious comma.

[temp.explicit] add missing comma.

N3652 - fix section names for C++11 compatibility sections.

N3638 - add missing paragraph
Update cross-references