M-x shell-command and M-x shell-command-on-region changed to make

M-x shell-command and M-x shell-command-on-region changed to make
process's working directory be the current buffer's default directory.
Procedures SHELL-COMMAND and RUN-SYNCHRONOUS-SUBPROCESS changed to
permit specification of this directory, and also to specify whether
PTYs should be used.  SHELL-COMMAND-ON-REGION eliminated because
SHELL-COMMAND now takes an input-region argument.