Include disabled options in the output of 'set +o'. POSIX says the output of

Include disabled options in the output of 'set +o'.  POSIX says the output of
set +o can be used to reload previous settings, for this to work disabled
options must be printed as well or otherwise options that were set in the mean
time won't be turned off.

Change /bin/sh so *it* implements the processing needed for scripts to
work as expected when they have a "shebang line" of:

     #!/bin/sh -- # -*- perl -*- -p

Obtained-from:  FreeBSD