DWDS/Dialing Concordance Code

review-2: merged r1322:1328 from 'delwin' branch into delwin-merge2

+ created branch delwin-merge2-1 for merging delwin -r1323:1352 into trunk

add +UnixSocketPerms to server options file: https://sourceforge.net/p/ddc-concordance/tickets/24/

use pid for peer name for unix domain sockets

use strerror instead of a string vector: https://sourceforge.net/p/ddc-concordance/tickets/22/

do not use typedefs here

delete unused source code in StructDict

delete unused code in GraphanLib

delete unused code in CommonLib/utilit.cpp

delete some unused graphematics code