user32: Add additional tests for scroll state, make them pass under Wine

[Alex Villací­s Lasso]

This patch adds a few tests for scrollbar behavior in Windows. It shows 
that if the window was created with at least WS_VSCROLL or WS_HSCROLL 
styles, WinXP returns default information for scrollbar range, but Win98 
returns an error, until first initialized. This error does not change if 
styles are set or cleared before initializing ranges. On both versions, 
setting either scrollbar range automatically initializes both if 
required (Wine still returned error for the other scrollbar - fix 
included). I have tried to test this on Win98 and WinXP-SP2, but maybe 
other versions are different. Could you please test this patch? Also, is 
it OK to tell apart Win9x vs. WinXP behavior in the way it is done in 
this patch? Once either behavior is identified, it is consistent on all 
future tests, as shown by the tests. Wine fixed to implement Win98 behavior.

Changelog:

* Document and test differences between WinXP and Win98 scrollbar behavior
* Make tests pass under Wine (Win98 behavior)

-- 
perl -e '$x=2.4;print sprintf("%.0f + %.0f = %.0f\n",$x,$x,$x+$x);'

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