Resize mini windows

[martin rudalics]

The attached patch does the following:

- Move some of the minibuffer resize code from xdisp.c to window.c and
  provide a common subroutine for automatic and manual resizing there.

- Remove the PIXELWISE argument from some of these functions since
  resizing minibuffer windows never rounds.

- Provide a new option called 'resize-mini-frames' which allows to
  automatically resize minibuffer-only frames according to the size of
  text they display.

If there are no objections, I intend to install in a few days.

Thanks for your attention, martin

resize_mini_windows.diff
Description: Text document