Fixes to Pager control

[Guy L. Albertelli]

In working on IE4 and the "Favorites" frame, the following issues arose with
the Pager control.

Changelog:
  Guy Albertelli  <<galberte at neo.lrun.com>>

  dlls/comctl32/pager.c
   - Make all WM_NOTIFY messages go to the parent.
   - Allow WM_WINDOWPOSCHANGING when the control is size 0 to set initial
size.
   - Combine multiple SetWindowPos calls in same processing line and make
the flags like native.
   - Redo WM_NCCALCSIZE to match native.
   - Since Pager is a "transparent" control (except for its own buttons),
the WM_ERASEBKGND
     needs to be passed to the parent. Also do the window offset like the
native control does.

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