Made changes to alphalem.conf

Not sure what largefile does; can't find reference in Yocto docs. Added
other features we want to support (as far as AlphaOne goes).

Signed-off-by: Mike Lewis <mikelewis@alphalem.com>
alphalem-image-basic: added some packages

Added typical editors, dropbear, etc. Keeping the example as a
sanity check.

Signed-off-by: Mike Lewis <mikelewis@alphalem.com>
base-files: fixed files path syntax

There appear to be different ways to do this depending on which docs
you're looking at. But this is the way it's done in the official Yocto
1.5 docs.

Signed-off-by: Mike Lewis <mikelewis@alphalem.com>