- the 3 argument version of getopts would not reset properly
- OPTARG did not get cleared after a non argument option was found
- OPTIND was not set properly after a non argument option.
This is used to implement the POSIX behavior when OPTIND=1
- Call setvarsafe instead of setvar. If one ran
"getopts optstr badvariable"
where badvariable contained an illegal variable name, there was no way
to recover, since setvar() would longjmp on the error.
