Bug#152217: /usr/bin/apt-get: Add new apt-get download command and make download dir the current dir

[Luis Mondesi <lemsx1@gmail.com>]

Package: apt
Version: 0.5.28.6
Followup-For: Bug #152217

apt-get download should simply be a call to (alias?):

apt-get -o 'Dir::State::status "./"' \
    -o 'Dir::Cache "./"
    --download-only --reinstall install 

Etc... whatever it's needed to let apt-get download the package by
non-root users. We don't need to install the package, we are downloading
only, so, no need to lock apt-get and no need to be root.
The current dir could probably be configurable with some new option
like: Dir::Download::Path. However, having it default to the current
directory is perhaps the correct thing to do.

Cheers.

-- Package-specific info:

-- apt-config dump --

APT "";
APT::Architecture "i386";
APT::Build-Essential "";
APT::Build-Essential:: "build-essential";
APT::Default-Release "sarge";
Dir "/";
Dir::State "var/lib/apt/";
Dir::State::lists "lists/";
Dir::State::cdroms "cdroms.list";
Dir::State::userstatus "status.user";
Dir::State::status "/var/lib/dpkg/status";
Dir::Cache "var/cache/apt/";
Dir::Cache::archives "archives/";
Dir::Cache::srcpkgcache "srcpkgcache.bin";
Dir::Cache::pkgcache "pkgcache.bin";
Dir::Etc "etc/apt/";
Dir::Etc::sourcelist "sources.list";
Dir::Etc::vendorlist "vendors.list";
Dir::Etc::vendorparts "vendors.list.d";
Dir::Etc::main "apt.conf";
Dir::Etc::parts "apt.conf.d";
Dir::Etc::preferences "preferences";
Dir::Bin "";
Dir::Bin::methods "/usr/lib/apt/methods";
Dir::Bin::dpkg "/usr/bin/dpkg";
DPkg "";
DPkg::Pre-Install-Pkgs "";
DPkg::Pre-Install-Pkgs:: "/usr/sbin/dpkg-preconfigure --apt || true";
DPkg::Post-Invoke "";
DPkg::Post-Invoke:: "if [ -x /usr/bin/debsums ]; then /usr/bin/debsums --generate=nocheck -sp /var/cache/apt/archives; fi";

-- (no /etc/apt/preferences present) --


-- (/etc/apt/sources.list present, but not submitted) --


-- System Information:
Debian Release: 3.1
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: i386 (i686)
Kernel: Linux 2.6.12-rc4-desktop-2
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=ISO-8859-1) (ignored: LC_ALL set to en_US)

Versions of packages apt depends on:
ii  libc6                       2.3.2.ds1-21 GNU C Library: Shared libraries an
ii  libgcc1                     1:3.4.3-12   GCC support library
ii  libstdc++5                  1:3.3.5-12   The GNU Standard C++ Library v3

-- no debconf information