Estimated hours taken: 0.75
library/string.m:
Fix a bug in string__format: it was not reporting an error
in the case where the argument list had more elements
than was appropriate for the format string.
tests/general/Mmakefile:
tests/general/string_format_test_2.m:
tests/general/string_format_test_2.exp:
tests/general/string_format_test_3.m:
tests/general/string_format_test_3.exp:
Test cases for the above-mentioned bug fix.
