s/sleep/Sleep/ for Windows in manager.cpp.
Added some methods to region to allow better access to raw chunk data.
Added ability to write regions back to file.
Implemented assignment operator, copy constructor for TagList/Compound.
Fixed NBT writing bug and added nested compound tag to the testcase.
NBT writing bug finally fixed.
NBT module might need some further reworkings according to the
management whether one should write the names/types of tags.
Changed vector.at() access in not-const method to operator[].
Moved constructors of TagCompound/List and fixed compiler error.
Changed class-wide chunk_offsets array to a local variable.
Added method to RegionFile-class to calculate index for chunk arrays.
Merge branch 'master' into azeroth
Added merge_regions script.