richedit: add tests for EM_FINDTEXT in 1.0 emulation, make them pass under Wine

[Alex Villací­s Lasso]

EM_FINDTEXT and EM_FINDTEXTEX have different rules for interpreting 
ranges for 1.0 and 2.0 modes:

In 1.0 emulation cpMin > cpMax is invalid and always fails.
In 1.0 emulation, search is always done between cpMin and cpMax, even 
backwards search.
In 1.0 emulation, cpMax == -1 assumes FR_DOWN, even if not set.

This goes a long way towards resolving richedit search problems in bug #709.

Changelog:
* Add tests for EM_FINDTEXT in 1.0 emulation, make them pass under Wine

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

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