builder: Upcase --delete and --scrub option arguments in man page.

For consistency with other options.

This updates commit 7820aaf1f3f1402811c1c3c8b2239aec0e12cf5e.
edit: Add virt-edit --edit as an alias for virt-edit -e.

This just adds the alias and does nothing else.
builder: Small copy-edit to the manual.
builder: Add --edit option.

This allows you to use Perl to edit files in the guest.

This works very similarly to the 'virt-edit -e' (non-interactive
editing) function.
builder: Document how to enable virtual consoles on Debian guests.
po: builder: Hack to remove duplicate message definition.

Because we're not running msgmerge but concatenating the PO files, you
can get duplicate messages (in this case "no"), resulting in this
error:

libguestfs.pot:6142: duplicate message definition...
libguestfs.pot:3285: ...this is the location of the first definition

Just work around this for now.
Version 1.23.31.