Deriving base port/package names

[Roger Marquis]

> A port name can contain digits and hyphens, so this could remove
> part of the name.

As in: `pkg rquery -a %n | grep -- '-[0-9]' | fmt`

   efax-0.9a font-adobe-100dpi font-adobe-75dpi font-adobe-utopia-100dpi
   font-adobe-utopia-75dpi font-bh-100dpi font-bh-75dpi
   font-bh-lucidatypewriter-100dpi font-bh-lucidatypewriter-75dpi
   font-bitstream-100dpi font-bitstream-75dpi gl-117 gnome-2048
   ja-edict-utf-8 ja-kon2-14dot ja-kon2-16dot ja-rubygem-mail-iso-2022-jp
   krb5-112 krb5-113 krb5-114 liblqr-1 libutf-8
   linux-enemyterritory-jaymod-217 linux-enemyterritory-omni-bot-0660
   nvidia-driver-304 nvidia-driver-340 onscripter-1byte p5-Acme-6502
   p5-Business-OnlinePayment-2CheckOut p5-Chemistry-3DBuilder p5-WWW-2ch
   p5-WWW-Shorten-0rz ppmd-7z qt5-3d quake2-3zb2 stf-6rd-kmod vte3-290
   xhtml-11 xorg-fonts-100dpi xorg-fonts-75dpi

Some of us see this as a weakness in the standard.  That plus the lack
of documentation where you'd expect to find it violates the principles
of least surprise and KIS.

Roger