gethostbyname fixed, socket->query_address() added, module_support added

Rev: src/Makefile.in:1.6
Rev: src/module_support.c:1.1
Rev: src/module_support.h:1.1
Rev: src/modules/files/configure.in:1.10
Rev: src/modules/files/efuns.c:1.6
Rev: src/modules/files/file.c:1.22
Rev: src/modules/files/file.h:1.2
Rev: src/modules/files/file_machine.h.in:1.5
Rev: src/modules/files/socket.c:1.5
Rev: src/modules/system/configure.in:1.3
Rev: src/modules/system/system.c:1.4
Rev: src/modules/system/system_machine.h.in:1.3