Refs #11101

Refs #6428 Fix for test failure  - if the free space block vector only contains an empty entry this should not be added to the map.

Refs #6428 Added method to DiskBuffer to set free space blocks (for loading). In getDiskBufferFileData() the free space blocks information is now set after reading the free_space_blocks group from the NeXus file.

(though in very ugly way)

fixed minor error related to this.

for everything that is outside of ISaveable test

Separated it into ISaveable.cpp and Saveable and changed memory buffer

Fixing Crystal, Geometry, Kernel and WorkflowAlgorithms.

(not fully tested yet on Win but there are hopes. )

All file based workspaces have to use disk buffer now. If the disk buffer size is set to 0, the data are saved to HDD (or discarded if not modified) as soon as they are free.

small changes to algorithms too to incorporate new logic of working

ISavable now knows about its position in file and works together with the DiskBuffer to identify the location of the data in the file.

into Kernel

by adding a mutex to DiskBuffer

with no MRU or 'small object' buffer. This is now simple a to-write buffer that tracks free space.
Hopefully fix issue in #4377.

Fixing mistake made while reverting.  Reverting to Janik's last change (32de2f9f).

Revert "Refs #3844 : I think this fixes the windows debug test failure of DiskMRU test. Will fix this ticket."

This reverts commit 32de2f9f.

Refs #3844 : I think this fixes the windows debug test failure of DiskMRU test. Will fix this ticket.

Refs #3557: With a more finely split input, MergeMDEW takes 25 minutes for 1 billion events but does not go blow up memory, remaining < 4 GB. This is in debug mode.

Refs #3587: DiskMRU tracking small objects; LoadMDEW sets the cache size to load small boxes and keeps them in memory.