CryptAcquireContext fixes

[Michael Jung]

Changelog:
	- Changed some FIXMEs to TRACEs, since they report on a problem in
	  the way the client uses the dll rather than in the dll itself.
	- Cover the case, when the pszProvider parameter points to an empty
          string.
	- Fixed some imprecisions in error reporting.
	- Removed the "wine_todo's" arround the corresponding unit-tests.

-- 
Michael Jung, MSc                               Be liberal in what you accept,
Integrated Circuits and Systems Lab         and conservative in what you send. 
University of Technology, Darmstadt       -- Jonathan Postel, Internet Pioneer
phone: +49(6151)16-6692 / email: mjung at iss.tu-darmstadt.de
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