File->pipe() now takes an argument

Rev: lib/master.pike:1.64
Rev: lib/modules/LR.pmod/Grammar_parser.pmod:1.5
Rev: lib/modules/Process.pmod:1.16
Rev: lib/modules/Stdio.pmod:1.10
Rev: src/callback.c:1.11
Rev: src/configure.in:1.154
Rev: src/fdlib.c:1.10
Rev: src/fdlib.h:1.7
Rev: src/modules/files/configure.in:1.39
Rev: src/modules/files/file.c:1.70
Rev: src/modules/files/file.h:1.6
Rev: src/modules/files/socket.c:1.26
Rev: src/modules/files/socktest.pike:1.8
Rev: src/modules/files/testsuite.in:1.11
Rev: src/program.c:1.58