Squashed 'sequence/' changes from 2691bee..efeb0fc

efeb0fc merge from master; version 0.5.4
0de04d0 depend on bytes; compliant with -safe-string
d95495d sequence.bigarray
15a0b9d fix release numbers

git-subtree-dir: sequence
git-subtree-split: efeb0fc99751bc8260f10da96fa26aac70585208
Merge commit '36423c01d2ab8881c9f8ac6d43fb7c945b0add59' from sequence
CCList.(>|=) map operator
more warnings
CCSequence now provides some bytes-dependent operations (so containers depends on bytes)
merge with github's master