Library users can now initialize and de-initialize the library multiple
times in one run of an application program.
+ Library users will now receive WIMLIB_PROGRESS_MSG_WRITE_STREAMS
+ messages more frequently when writing large WIM files.
+
+ Added experimental new write flag:
+ WIMLIB_WRITE_FLAG_SEND_DONE_WITH_FILE_MESSAGES.
+
Version 1.7.0:
Improved compression, decompression, and extraction performance.