pakfire.cgi: Changes to 'Install' confirmation page

pakfire.cgi: Changes to 'Install' confirmation page

- Comma separate package names if multiple packages selected to install.

 - Display dependencies for package(s) to install in 'parent -> child' format.

 - Formatting and verbiage changes.

 - No functional changes to the install process.

Signed-off-by: Stephen Cuka <stephen@firemypi.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>