[sdpd] DDM update with QPA

[Leonid Solovyov <l_solovyov...@yahoo.com>]

Dear colleagues,

An updated version of the Derivative Difference Minimization (DDM)
program is available at:

http://icct.krasn.ru/eng/content/persons/Sol_LA/ddm.html

Beside other changes and additions, quantitative phase analysis (QPA)
calculations are added. Tests of DDM with QPA Round Robin samples are
included in 'QPA' folder of the DDM program package.

One more example (EXAMPLE7) is given where H atom positions were
successfully refined by DDM without restrains. The details of the study
are published in
L. A. Solovyov, A. M. Astachov, M. S. Molokeev and A. D. Vasiliev,
Powder diffraction crystal structure analysis using derivative
difference minimization: example of the potassium salt 
of 1-(tetrazol-5-yl)-2-nitroguanidine,
Acta Cryst. (2005), B61, 435-442.
This paper also describes the DDM profile decomposition procedure.

Good luck and best wishes,
Leonid Solovyov


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