.ackrc: nuke, doesn't work with ack 2

I don't even use the thing anyway:

    Option '--all' is not valid in ack 2
    This is because we now have -k/--known-types which makes it only select files
    of known types, rather than any text file (which is the behavior of ack 1.x).
    You may have options in a .ackrc, or in the ACKRC_OPTIONS environment variable.
    Try using the --dump flag.
Some misc changes I had around