Upload of v2.06 (build #856)

see Docs/CHANGE_LOG.htm for details.
added downloads/build-2.06.doc.zip
added downloads/build-2.06.src.zip
added downloads/build_win_2.06.exe
modified trunk/Docs/AUTO_BUILD_NUMBER.htm
modified trunk/Docs/CHANGE_LOG.htm
modified trunk/Docs/COMMAND_LINE.htm
modified trunk/Docs/DLL_LIBRARIES.htm
modified trunk/Docs/index.htm
modified trunk/Docs/PRAGMA.htm
modified trunk/Docs/RESPONSE_FILE.htm
modified trunk/Docs/RULE_DEFINITION_FILE.htm
modified trunk/Docs/SWITCHES.htm
modified trunk/Docs/TO_DO.htm
modified trunk/Source/build.d
modified trunk/Source/build_bn.d
modified trunk/Source/source_bn.d
modified trunk/Source/util/bmscanner_bn.d
modified trunk/Source/util/fdt_bn.d
modified trunk/Source/util/fileex_bn.d
modified trunk/Source/util/linetoken_bn.d
modified trunk/Source/util/pathex_bn.d
modified trunk/Source/util/str_bn.d