Support for DISCNUMBER tag?

[Tim Curtis]

MPD supports the Disc tag but moOde only uses Genre/Artist/Album/Track tags to generate the Library panel.
https://www.musicpd.org/doc/protocol/tags.html

Below is a multi-disc album from my collection. It was imported using iTunes and none of file names or tags were altered other than setting AlbumArtist tag = Artist. No issues in the Library panel

Code:

pi@rp3:~ $ ls -l /mnt/NAS/Music/Ray\ Charles/
total 0
drwxrwxrwx 2 root root 0 Sep 22  2017 Blues + Jazz [Disc 1]
drwxrwxrwx 2 root root 0 Sep 22  2017 Blues + Jazz [Disc 2]
pi@rp3:~ $ ls -l /mnt/NAS/Music/Ray\ Charles/Blues\ +\ Jazz\ \[Disc\ 1]
total 232448
-rwxrwxrwx 1 root root  8655278 Jan 31  2017 1-01 Someday (Single Version) (1950).flac
-rwxrwxrwx 1 root root  7587080 Jan 31  2017 1-02 The Sun's Gonna Shine Again.flac
-rwxrwxrwx 1 root root  8115392 Jan 31  2017 1-03 The Midnight Hour.flac
-rwxrwxrwx 1 root root  8761146 Jan 31  2017 1-04 Worried Life Blues.flac
-rwxrwxrwx 1 root root  7665178 Jan 31  2017 1-05 Low Society.flac
-rwxrwxrwx 1 root root  9303085 Jan 31  2017 1-06 Losing Hand.flac
-rwxrwxrwx 1 root root 10565212 Jan 31  2017 1-07 Sinner's Prayer.flac
-rwxrwxrwx 1 root root  9933155 Jan 31  2017 1-08 Funny But I Still Love You.flac
-rwxrwxrwx 1 root root  9323794 Jan 31  2017 1-09 Feelin' Sad.flac
-rwxrwxrwx 1 root root  9284803 Jan 31  2017 1-10 I Wonder Who.flac
-rwxrwxrwx 1 root root  7641691 Jan 31  2017 1-11 Nobody Cares (Single_LP Version.flac
-rwxrwxrwx 1 root root  8085481 Jan 31  2017 1-12 Ray's Blues (Single_LP Version).flac
-rwxrwxrwx 1 root root  7567999 Jan 31  2017 1-13 Mr. Charles Blues (Single_LP Ve.flac
-rwxrwxrwx 1 root root  6636746 Jan 31  2017 1-14 Blackjack (Single_LP Version).flac
-rwxrwxrwx 1 root root  8955989 Jan 31  2017 1-15 Come Back ( Baby) (Single_LP Ve.flac
-rwxrwxrwx 1 root root  8968942 Jan 31  2017 1-16 A Fool For You (Single_LP Versi.flac
-rwxrwxrwx 1 root root  8393595 Jan 31  2017 1-17 Hard Times (No One Knows Better.flac
-rwxrwxrwx 1 root root  9554095 Jan 31  2017 1-18 Drown In My Own Tears (Single_L.flac
-rwxrwxrwx 1 root root  7460741 Jan 31  2017 1-19 What Would I Do Without You (Si.flac
-rwxrwxrwx 1 root root  9026728 Jan 31  2017 1-20 I Want A Little Girl (Single_LP.flac
-rwxrwxrwx 1 root root  9209642 Jan 31  2017 1-21 Early In The Morning.flac
-rwxrwxrwx 1 root root 12160894 Jan 31  2017 1-22 Night Time Is The Right Time.flac
-rwxrwxrwx 1 root root 22592149 Jan 31  2017 1-23 Two Years Of Torture.flac
-rwxrwxrwx 1 root root  8736220 Jan 31  2017 1-24 I Believe To My Soul.flac
pi@rp3:~ $ telnet localhost 6600
Trying ::1...
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
OK MPD 0.20.0
lsinfo "NAS/Music/Ray Charles/Blues + Jazz [Disc 1]"
file: NAS/Music/Ray Charles/Blues + Jazz [Disc 1]/1-01 Someday (Single Version) (1950).flac
Last-Modified: 2017-02-01T01:29:24Z
Time: 188
duration: 187.906
Title: Someday (Single Version) (1950)
Artist: Ray Charles
Album: Blues + Jazz [Disc 1]
Genre: R&B
Composer: Ray Charles
AlbumArtist: Ray Charles
Track: 1
Disc: 1
Date: 1950
file: NAS/Music/Ray Charles/Blues + Jazz [Disc 1]/1-02 The Sun's Gonna Shine Again.flac
Last-Modified: 2017-02-01T01:29:26Z
Time: 158
duration: 157.733
Title: The Sun's Gonna Shine Again
Artist: Ray Charles
Album: Blues + Jazz [Disc 1]
Genre: R&B
Composer: Ray Charles
AlbumArtist: Ray Charles
Track: 2
Disc: 1
Date: 1953
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