Bug#543256: Make installing recommends optional

[Frans Pop <elendil@planet.nl>]

tags 543256 pending
thanks

On Sunday 23 August 2009, Frans Pop wrote:
> Attached patches (untested, but straightforward) for three components:
> - base-installer, where the question will be asked and which will
>   configure apt accordingly; this means the base system installation
>   will now also install Recommends (for CD-based installs [1]: only if
>   available on the CD [2]!); the selected setting will persist for the
>   installed system
> - di-utils: apt-install will now respect the global option instead of
>   always disabling Recommends
> - pkgsel: same, plus removes now redundant question for additional
>   packages

I've committed the patches with the following changes:
- the question is never asked, but the setting must either be preseeded
  or set at the boot prompt (using 'recommends=false')
- I've preserved --no-recommends for the security updates step, as
  allowing aptitude to install new packages there would result in
  inconsistent behavior (randomly depending on for which packages
  updates are available)
- two minor bugs fixed that were found during testing
- added the 'recommends' alias for the template

Cheers,
FJP