* The following low level packet routines now fully support non-blocking:
libssh2_sftp_packet_read()
libssh2_sftp_packet_ask()
libssh2_sftp_packet_require()
libssh2_sftp_packet_requirev()
* libssh2_sftp_readdirnb() functions completely in non-blocking mode
* The rest of the routines which call the libssh2_sftp_packet_* routine
loop on a return code of PACKET_EAGAIN. This maintains the current
functionality until they fully support non-blocking
* The state of all function are labeled with either NB-SAFE or NB-UNSAFE,
for those that are know. NB-UNSAFE?? for those that haven't been
examined.
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