#2 use wind_set(WF_WORKXYWH) when available

[Arnaud BERCEGEAY]

windom should internally use wind_set(WF_WORKXYWH) when
available instead of wind_calc().

When a windom application runs on an AES which support
wind_set(WF_WORKXYWH), wind_calc() shall not be used,
unless explicitly called by the application.

=> WindCalc() should be deprecated
=> WindSet(WF_WORKXYWH) should work for all AESes

[Arnaud BERCEGEAY]

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current CVS version of windom now use wind_get(WF_WORKXYWH)
and wind_set(WF_WORKXYWH) when WindGet(WF_WORKXYWH) and
WindSet(WF_WORKXYWH) are called.

STILL TODO: remove usage of wind_calc() (and WindCalc()) if
possible in windom and its examples/demo.