Update prepare_getOptions function.
- Previously, the help option accepted an argument. Since
documentation related to internal functions was moved to a reference
manual and man pages are no longer supported for them, the help
option prints the script or module documentation only, and no option
argument should be used for the help option in any case (it wouldn't
print anything). This update updates the prepare_getOptions function
to eliminate the possibility of passing option arguments to the help
Likewise, the first argument of tcar_printHelp function is no longer
required. The tcar_printHelp function is working with the
TCAR_MODULE_NAME environment variable to determine the man page that
must be printed out.