viewstk_init(): Don't reload

Apparently, SetScrollInfo() sends a second WM_SIZE message, which in turn overwrites our saved window size with the size of the previous window...
ia32(): Check np2stopemulate after every instruction

This allows the emulation to be paused from the Visual C++ debugger, e.g. on certain functions
Transparently support Protected Mode in the debug utility

... I guess it's kinda confusing like this, but well, that's how DOS sees it, too.