Enable user to write shorthand in tabular markup

[MatthewIreland]

"Repeat" shorthand should be unpacked, to save user time when entering annotations in tabular format.

Example

1,-1,Scherzo,A,Theme a,X
5,-1,,,,X
Repeat: 1-8,,,,,

Should become

1,-1,Scherzo,A,Theme a,X
2,
3,
4,
5,-1,,,,X
6,
7,
8,
1a,-1,Scherzo,A,Theme a,X
2a,
3a,
4a,
5a,-1,,,,X
6a,
7a,
8a,

Also "range equality":

33-36=1-4,-1,,A,Theme a,X
37,-1,,,,X
41,-1,,X,,

Becomes

33,-1,,A,Theme a,X
34,
35,
36,
37,-1,,,,X
38,
39,
40,
41,-1,,X,,