Merge pull request #1 from Drup/master

Build and install sequence.cmxs
document to_list
decreasing int range operator
printing functions
added a benchmark for persistent; moved all benchs to bench/
API change for Sequence.persistent: no need to
provide a block size, the unrolled list manages it (doubling block size);
new implementation for persistent is more efficient.
use oasis
change the interface of min/max so that they return an option
in case the sequence is empty
cleanup of Infix (removed some operators);
remove TypeClass
conversion with Gen
add bin_annot
Sequence.persistent_lazy added, for caching without upfront cost
apparently drup doesn't like polymorphic variants
changelog
removed deprecated Bench and replace it with Benchmark
Add a reading bench for persistent sequences.