shells/v7sh 1.0_2

The original Steve R. Bourne shell from the 7th edition Unix including System III, 4.3BSD-Reno, Ultrix 3.1 and ``home made'' fixes and enhancements :

* `--' end of options added (sysIII). `set +x' and such added (sysIII). `/etc/bsh_profile' (sysIII) and `$HOME/.bsh_profile' (unsw) are sourced at login time if they exist. Initially, only the `.profile' located in the current directory was sourced at login time if it exists. They have been `bsh_' prefixed to avoid conflicts w/ the standards `profiles' which can contains unsupported expressions such as shell functions. negation (! or ^) in `[]' added (sysIII). `${x:-x}' and similar expressions added (sysIII). '<<-' (aka strip leading tab in here document) added (sysIII). `#' comments are allowed in shell scripts (sysIII/reno), but not on the command line (reno) ! `break N' and `continue N' fixed (sysIII/ultrix). `if... then... [elif... [else...]] fi' fixed (reno). `test' (sysIII) and `ulimit' (ultrix) builtins added. * ANSI-fication to permit an almost warning free compilation (home made). `union trenod' taken from 4.3BSD-Reno. better signal handling and error recovery (sysIII/reno). better restricted shell (sysIII) and IFS protection (reno). * functions aren't supported and command line input is not 8 bit clean.