Extended Transcript and TranscriptEntry.

You can now iterate the entries in a transcript:

    for entry in score_manager._transcript:
        ...

You can also now iterate the lines in a transcript entry:

    for line in score_manager._transcript[0]:
        ...

Implement a 'first_lines' property on Transcript. Example:

    >>> for line in score_manager._transcript.first_lines: repr(line)
    'Score manager - example scores'
    '> m'
    'Score manager - material library'
    '> nmh'
    'Package name> b'
    'Score manager - material library'
    '> q'

Use for writing tests.