Merge pull request #65 in ASAPO/asapo from bugfix_error-sending-data-using-callback-method to develop

* commit '53994521':
  fix segfault
  fix
  fix bug with callback
  fix bug with multidimentional numpy array and wait threads function

* commit 'c08f7ff1':
  update producer errors
  fix segfault
  stop producer threads at python exit
  try-except block for wait_requests_finished, nogil
  add functions to get requests pool size and wait until pool is empty

* commit 'ad9f06f5':
  Fix interoperability with pninexus.h5cpp

* commit 'cc372a3c':
  update deploy scripts
  fix windows test
  fix windows test
  fix tests
  receiver receives file directly on disk
  fix tests
  start refactoring receiver
  git rid of some compile warnings
  fix tests
  get rid of transmitfile on windows, use general solution
  fix windows
  use read/send instead of sendfile
  used sendfile/transmitfile to transmit files over network
  get filesize during request process, refgactor receiver errors
  refactor producer and request pool
  allow transfer large files, memory need to be allocated

Without this fix, importing pninexus.h5cpp after asapo_producer crashed
the interpreter with a std::bad_cast exception,
cf. https://stackoverflow.com/questions/3765669
and commit 9bee6cd6

* commit 'fa4212ac':
  add maxwell tests to git
  updated manual test
  small fixes
  discovery services can find ib address, parameter for mongo_dir
  upadte dummy producer, set number of threads for datacenter