Added command-line option -C (capital 'C'):

- This option instruts JSexec to *not* change the current working directory to
  the control (CTRL) directory
- This is useful when using jsexec to deal with files and passing relative
  paths or wildcards on the command-line
- Warning: scripts executed with this option may behave differently than the
  same script executed from SBBS where the current working directory is always
  the CTRL directory.