Allow multiple --ignore flags

[amosonn]

pacman used to take a single --ignore flag with multiple packages. Now it requires an --ignore flag for each package which should be ignored. However, if attempting to do so with aura, you get the following error:

error: the argument '--ignore <pkg>' cannot be used multiple times

which means that it's only possible to ignore a single package within an update.

[fosskers]

From the Pacman manpage:

       --ignore <package>
           Directs pacman to ignore upgrades of package even if there is one available. Multiple packages can be
           specified by separating them with a comma.

       --ignoregroup <group>
           Directs pacman to ignore upgrades of all packages in group, even if there is one available. Multiple
           groups can be specified by separating them with a comma.

So you're correct and Aura should behave the same way.