Install dash
Explicitly set gnus init and startup files

Some change in initialization has resulted in different values for these
variables (not sure exactly what), so I am setting explicitly. I'm also
changing them to visible files since they are already in a hidden
directory.
Move over some things from gnus.el

Some code was kept in gnus.el because gnus had not yet been initialized,
but now I'm just loading gnus in km-gnus.el.
Remove unused fetch function