Add simple class to store the info of scanned region files.
Add isworld to World class in world.py.
Add scan_world function to scan.py.
Move constants outside of world object, update mca strings to region.
Scanning now works with the new implementation. Lot's of TODOs.
Change how the status is printed.
Add get_name() to world.
Add todo and change strings.
Fix the scan_chunk function.
Also fill scan_time in the scan_chun function.
Add scan_and_fill() and make it the default in scan_regionfile.
Add list_chunks() to World, RegionSet and ScannedRegionFile.
RegionSets are now scanned.
Fix scanning, replace bad chunks half-done.
Fix sacanning of corruted chunks.
Print things, add todos.
Remove del. Handle IOError.
Move summary line to region-fixer.py.
Change all world references to world_obj.
Update the checking of incompatible options.