*) Fix crash which could happen when deleting a non-existing file
*) Add "mmap" flag to the constructor(s), allowing to explicitly enable or
disable mmap usage
*) Keep weak references on close()
*) Fix reference leak on failed file close
*) Add "close" flag to the contructor(s) allowing CDB to close the file even if
it didn't open it.
*) Documentation fixes
*) Ensure the extension version is versioned as expected
*) Increase GCC happiness
*) Add x86_64, i686 and aarch64 wheels
*) Update python support: 2.7, 3.6+