select_display: per-database output

This function is used both for provision and group selection. Now the
database name will be displayed.

$ pacman  -S base-devel
:: There are 11 members in group base-devel:
:: Repository testing
   1) make
:: Repository core
   2) autoconf  3) automake  4) bison  5) fakeroot  6) flex  7) gcc  8) libtool  9) m4  10) patch  11) pkg-config
Which ones do you want to install?
Enter a number (default=all):

Signed-off-by: Xavier Chantry <chantry.xavier@gmail.com>

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