Remove "iso-" infix from window combination functions.

Remove "iso-" infix from window combination functions.

* window.el (window-iso-combination-p, window-iso-combined-p)
(window-iso-combinations): Remove "iso-" infix.  Suggested by
Chong Yidong.
(window-min-size-1, window-size-fixed-1, window-min-delta-1)
(window-max-delta-1, window-resize, window--resize-siblings)
(window--resize-this-window, adjust-window-trailing-edge)
(split-window, balance-windows-1)
(shrink-window-if-larger-than-buffer):
* calendar/calendar.el (calendar-generate-window):
* help.el (resize-temp-buffer-window): Adjust callers
accordingly.
* windows.texi (Windows and Frames): Remove "iso-" infix from
documentation of window-iso-combined-p.