Also added some asserts and logging to trans.

Modified graph500 to use the shared_arc, but this unfortunately doesn't work due to #2444.

Fleshing out result methods

(cargo) fixed a package installation bug, cleaned up usage

The result module doesn't follow the standard iter/map pattern
that we use in the rest of the library. So to

std: Fix bitv each() method (issue 2363)

Since `os::copy_file` wasn't preserving the executable permissions,
this reverts back to `run::run_program` and `cp` to install
the packages.

This fixes a bug where os::copy_file was called with a directory name, and
updates the command line options and usage messages for clarity.

Update the rustc manpage

cc #2433

Add an internal notion of 'implicit copyability' and use it to warn when implicitly copying mutable data and some unique data. Closes #2448.