Log Message:

update to version 0.13.0

    ADDED: option -v|--assign that works like AWK's -v option.
    This is to pass some variables to AWK interpreter.
    Example: runawk -v var=123 -e 'BEGIN {print var }'

    modules/xgetline.awk: better error message/clean-ups

    modules/abort.awk: NR is also printed to stderr

    minor fixes in *.c

    clean-ups and fixes in 'make test'. Now it doesn't depend on my
    own system and runawk directory

    'make test' exits with non-zero exit status if regression tests
    fail

    Makefile: ported to ancient pmake-1.45 found in some Linux distros