am 23 July 08

copy files from /home/liuh/Documents/tiegcm
files with modifications
main.tex*   
neutraldyn.tex
divrg.tex* 

same as in /home/tgcm/doc/description/get_documents  
duv.tex*       
addiag.tex*    

* refernce missing: Dickinsen at al. 1981
