Fork channel

Create a new channel as a copy of main.

Rename channel

Rename main to:

Delete channel

Delete main? This cannot be undone.

help.test
RUN: llvm-nm --help 2>&1 | FileCheck --implicit-check-not="General Options:" %s
RUN: llvm-nm -h 2>&1 | FileCheck --implicit-check-not="General Options:" %s
CHECK: OPTIONS:
CHECK:   --debug-syms
CHECK:   --demangle
CHECK:   --format=<format>
CHECK: llvm-nm Mach-O Specific Options:
CHECK:   --arch=<value>
CHECK:   -s
CHECK: Pass @FILE {{.*}}