single exclamation mark: possibly a bug in the sequence parser

[bwagner]

dur "{0.05 0.05 0.4 0.05 0.4}%7"
and
dur "{0.05 ! 0.4 0.05 0.4}%7"

should produce the same result, but they don't.

http://lurk.org/r/post/4ZkzGA6oukTloNXX0IBDcs

[bgold-cosmos]

I think @ has the same issue.
s "bd@2 cp hh"
sounds different from
s "{bd@2 cp hh}%4"

_ seems fine, though.

[yaxu]

This still seems to be an issue, e.g. "{1 !}%2" :: Pattern Int gives "1 1 1 1"

[yaxu]

Needs tackling alongside #369

I think the parser needs refactoring, with an additional datatype, TSeq for subsequences alongside TPat. Then a polyrhythm is a collection of sequences.

Euclidian rhythms should be patterns rather than sequences, as it's useful for the parameters are patternable. I'm unsure whether enumerations should be patterns or sequences. Their parameters currently are patternable. The choice is between allowing <0 .. 3> to be the same as <0 1 2 3> but <<0 2> .. <4 5>> not working, or having it be the same as <[0 1 2 3]>, and <0 2> .. <4 5> working. I think I prefer the former.