bitrate field

[podly]

{bitrate} filed show nice value, but only for three digits bitrates like 128k. If you try to see bitrate of high density flac with bitrate over 1000kbps you will see only last 3 digits. Easy to correct in display_fields.py

@register_field
class BitRateField(Field):
    base_name = 'bitrate'
    target_hooks = ['status']

    def _format_bitrate(self, bitrate=0):
        bitrate = int(bitrate)
        return '%4d' % bitrate

    def __init__(self, **kwargs):
        width = len(self._format_bitrate())
        super(BitRateField, self).__init__(width=width, **kwargs)