tutorial.md : correct formula in fn area()

change formula (other solution could be using abs()).
Fix for make -j race from #9531 injected by cleanup in b1a22518f0c687db.
Visibility fixes
Register new snapshots
rustdoc: Don't emit redirect pages for variants/fields

It's just a waste of disk space and it can be done just as well in JS.
rustdoc: Fix searching for default methods

Closes #9566
rustdoc: Fix search for something on the same page
Suppress warning by removing unused import
rustdoc: Include source files with documentation

All items have source links back to their actual code. Source files can be
omitted with the doc(html_no_source) attribute on the crate. Currently there is
no syntax highlighting, but that will come with syntax highlighting with all
other snippets.

Closes #2072
mk: Don't require pandoc to run rustdoc
std::vec: Add benchmark for .concat_vec and .connect_vec
std::vec: Sane implementations for connect_vec and concat_vec

Avoid unnecessary copying of subvectors, and calculate the needed space
beforehand. These implementations are simple but better than the
previous.

Also only implement it once, for all `Vector<T>` using:

    impl<'self, T: Clone, V: Vector<T>> VectorVector<T> for &'self [V]

performance improved according to the bench test:

    before
    test vec::bench::concat ... bench: 74818 ns/iter (+/- 408)
    test vec::bench::connect ... bench: 87066 ns/iter (+/- 376)

    after
    test vec::bench::concat ... bench: 17724 ns/iter (+/- 126)
    test vec::bench::connect ... bench: 18353 ns/iter (+/- 691)

Closes #9581
auto merge of #9559 : sfackler/rust/more-visibility, r=alexcrichton
std::vec: Remove functions concat, connect

std::vec::{concat, connect, concat_slices, connect_slices} are replaced
by the already existing trait methods .concat_vec() and .connect_vec().
auto merge of #9562 : alexcrichton/rust/snapshots, r=thestinger
auto merge of #9574 : FlaPer87/rust/suppress_warnings, r=metajack

Small change that suppresses a warning because of an unused import.
auto merge of #9459 : eliovir/rust/patch-1, r=bstrie

change formula (other solution could be using abs()).
auto merge of #9583 : blake2-ppc/rust/connect-vec, r=huonw

std::vec: Sane implementations for connect_vec and concat_vec

Avoid unnecessary copying of subvectors, and calculate the needed space
beforehand. These implementations are simple but better than the
previous.

Also only implement it once, for all `Vector<T>` using:

    impl<'self, T: Clone, V: Vector<T>> VectorVector<T> for &'self [V]

Closes #9581
rustdoc: Show type parameters on external paths

This removes the internal type representation of an `External` type and instead
relies on passing around DefId structures and interpreting them accordingly.

Progress on #9539, but there's still the problem of a crate => url mapping.
auto merge of #9577 : alexcrichton/rust/rustdoc, r=cmr

They're getting smaller each time though!

The highlight of this round is source files in documentation. Still trying to figure out the best syntax-highlighting solution.