v5.010

        - stop sharing a reference to cached PPI docs, which led to spooky
          action at a distance
        - PkgVersion no longer surrounds the new $VERSION assignment with a
          bare block
        - if there's a blank line after the package statement (and any number
          of comment-only lines), PkgVersion will use that for a $VERSION
          assignment, rather than insert a new line; this can be made mandatory
          with die_on_line_insertion