[sdpd] DDM update

["L_Solovyov" <l_solovyov...@yahoo.com>]

Dear All,

The DDM program is updated at
www.icct.ru/eng/content/persons/Sol_LA/ddm.htm
<http://www.icct.ru/eng/content/persons/Sol_LA/ddm.html> l
<http://www.icct.ru/eng/content/persons/Sol_LA/ddm.html>
and mirrored at
www.geocities.com/l_solovyov/ddm.html
<http://www.geocities.com/l_solovyov/ddm.html>

The main changes:
1. DDMap <http://www.icct.ru/eng/content/persons/Sol_LA/ddmap.png> 
utility is added. This program reads crystal data and structure factors
from CIF file, calculates Fourier and Patterson maps including the
Symmetry and Image minimum functions and allows viewing manually chosen
sections of the 3D density map. The structure model may be
built/modified within DDMap by adding/removing atoms.
2. The space group interpretation and reflection generation routines
were changed to more flexible and reliable ones. The rhombohedral
setting and the  acentric origin choice 1 are allowed.
3. The symmetry restrictions on all parameters are imposed automatically
by the program.
4. An automatic procedure for the initial overall scale factor
estimation is added.
5. New weighting scheme is added that is chosen now by IWGHT flag.
6. New asymmetry parameter P2 responsible for the lattice-gradient
effect is added.

Other changes are listed in history.txt

Best regards,
Leonid Solovyov

*******************************************************
Leonid A. Solovyov
Institute of Chemistry and Chemical Technology
660049, K. Marx 42, Krasnoyarsk, Russia
www.icct.ru/eng/content/persons/Sol_LA
<http://www.icct.ru/eng/content/persons/Sol_LA>
www.geocities.com/l_solovyov <http://www.geocities.com/l_solovyov>
*******************************************************


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