Update README on how to send proper patches

Add a few lines of explanations on how to correctly setup
and use Mercurial to send proper patches.

Add sections to the README

Fix typo in README

Update the README with the new URL to the project homepage

The URL for the crosstool-NG homepage has changed. Update the
README accordingly. The old URL is still valid, though.

config/gcc: re-order versions

Move the gcc-4.3.4 version to its place.

gcc: add support for 4.3.4

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

gcc: add patch to fix PR37436

When compiling some C++ code, GCC 4.3.x fails with an internal
compiler error. The bug report is available at
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37436. The included patch
is the one that has been merged in the trunk of gcc.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

config: make CONFIG_SHELL default to bash

Some components (eg. GMP) will fail to correctly build if
the CONFIG_SHELL is not bash (eg. ash or dash). So make bash
the default CONFIG_SHELL.

Keep ash as a possible selection, as future versions of those
currently /broken/ tools may come fixed wrt to CONFIG_SHELL
being POSIX-ly compliant.

Tagging release 1.4.2

1.4: update version to 1.4.2