0.7.5

• Lots of internal changes and fixes in the storage engine.
• check-storage now has a -rebuild flag to rebuild index and meta data files from scratch. It will also check the full block chain trees of datasets and mark them as invalid if any referenced data is missing.
• gc now has a -threshold flag to set at which dead space threshold files should be compacted. Also added a -force flag to force a mark and sweep even if datasets with broken chains exists. Please note that data referenced by broken datasets are subject for deletion.
• This version contains compatibility breaking changes. You will need to delete all .db files from the account folder and rebuild them using the check-storage command.
• [Hashback] Folder permissions are now restored after being populated to avoid access errors during restore.