install library from web or local files system.

    :param url: web address or file path
    :param replace_existing: bool
    :rtype: None

def install_lib(url, replace_existing=False, fix_wprogram=True):
    """install library from web or local files system.

    :param url: web address or file path
    :param replace_existing: bool
    :rtype: None

    """
    d = tmpdir(tmpdir())
    f = download(url)
    Archive(f).extractall(d)

    clean_dir(d)
    d, src_dlib = find_lib_dir(d)
    move_examples(d, src_dlib)
    fix_examples_dir(src_dlib)
    if fix_wprogram:
        fix_wprogram_in_files(src_dlib)

    targ_dlib = libraries_dir() / src_dlib.name
    if targ_dlib.exists():
        log.debug('library already exists: %s', targ_dlib)
        if replace_existing:
            log.debug('remove %s', targ_dlib)
            targ_dlib.rmtree()
        else:
            raise ConfduinoError('library already exists:' + targ_dlib)

    log.debug('move %s -> %s', src_dlib, targ_dlib)
    src_dlib.move(targ_dlib)

    libraries_dir().copymode(targ_dlib)
    for x in targ_dlib.walk():
        libraries_dir().copymode(x)
    return targ_dlib.name