src/pacman : rework the display_targets function.

We had a lot of duplicated code here. The code handling the showsize option
needed to be there three times :
1) for install part of -S
2) for remove part of -S (conflict removal)
3) for -R

This patch introduce a new display_targets(pkglist, install) function which
can handle the 3 cases above. We pass install == 1 for case 1), and install
== 0 for case 2) and 3).

Now we can finally get the benefit of an old patch which handled the
ShowSize option consistently in the 3 cases above, without an awful lot of
duplicated code :
http://www.archlinux.org/pipermail/pacman-dev/2008-January/011029.html

Signed-off-by: Xavier Chantry <shiningxc@gmail.com>
Signed-off-by: Dan McGee <dan@archlinux.org>

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