1.1.1 - build system and test fixes

This minor release includes no changes to the library.

• ship lmdb c library as a fallback when no system library is available. This helps windows where MSYS2 does not include lmdb and cygwin has broken and outdated lmdb 0.9.19
• ship seq_of_dispenser to support tests on OCaml < 4.14.
• increase size of test environment to avoid Map_full on OSX. Tests still fail most of the time on OSX.

1.1

• Fix bad allocation pattern in mdbs_cursor_get causing sporadic segfaults.
• Add Map.close. Map/dbi slots are not freed by the GC anymore.
• Implement Map.to_dispenser iterator to be used with the Stdlib.Seq module.
• Deprecate iterators in the Cursor module. They can be easily constructed from a dispenser via Stdlib.Seq or the Gen module.
• adjust depexts for alpine, rhel, centos, opensuse
• Fix bogus warning about unused type in Map.create
• fix simle_db.ml example
• few documentation fixes

1.0

• drop support for OCaml 4.02
• add benchmark
• add tests
• fix several bugs
• move away from ctypes, implement stubs in C
  • fixing a use-after-free bug and memory leaks
  • use (possibly mmaped) Bigstrings as representation of raw keys / values
  • also export the new raw bindings in case someone does not like the high level api
• drop oasis, use dune
• use MDB_RESERVE when possible (no duplicates, converter using provided allocator)
• restructure the Modules to allow global transactions
• cursors can no longer be cancelled - transactions can
• phantom types for duplicates
• more cursor movements
• implement GET_MULTIPLE as *_all functions
• implement iterators making use of GET_MULTIPLE where possible
• single key-value databases are now called Map

0.1

Initial version.