add preliminary persisteddb
Merge branch 'develop' into pdb-refactor
have filedb inherit from persisted_db
Major refactor of persisted databases; FileDb overhaul
Moved all persistence_layer logic into FileDb except for file helpers, which are
awaiting further refactoring. Makefile overhaul to use DMD by default, however
DMD ~master is now required to compile DIQS.
Update msgpack
move magickwand resize work into other thread to fix segfault
added more server functionality, make images from disk load in another thread
Merge branch 'pdb-refactor' into develop
fix segfault when synchronizing in a destructor