standard lib: added getopt.tes for parsing command line options in scripts

 * this uses an optstring compatible with getopt(3).
 * It does not use repeated getopt calls to iterate options, though
   but places the results in registers beginning with "getopt.".
   E.g. option "C" will result in "getopt.C" being set after the
   call to setopt.
   String arguments are supported and are placed in the string part
   of the getopt registers.
 * The grosciteco.tes and symbols-extract.tes scripts make use of
   getopt now, to simplify and clean up their command line handling.

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