Minor grammar fixes in documentation.
Fix: calling bytes_to_sector.
Introduced in 4017af1b8c.
Mark currently failing tests.
Fix: populate chunk_headers after writing a chunk.
This fixes test 41: Write and Read New Chunk.
Simplify get_size().
Use SEEK_END constant for clarity.
Clarify in-line documentation.
Support printing of Exceptions.
Support uncompressed chunks.
iter_chunks() silently ignores unreadable chunks.
Fix test 03.
get_chunk() raises InconceivedChunk for non-existent chunks.
RegionFile.get_chunk() no longer returns None, but either raises an exception or returns a NBTFile().
Chunks with length 0 now raises a ChunkHeaderError.
Fix test 24: Read zero length chunk.
Fix: sector length of 0 properly detected.
Status is now STATUS_CHUNK_MISMATCHED_LENGTHS instead of STATUS_CHUNK_OK.
Fix: allow appending sectors to the file.
Fix: correct for header size in chunk length.