Added

• new 'end_id' parameter for diff processing functions
• new end ID/date parameters for pyosmium tools

Fixed

• restore packaging of README
• use replace() instead of rename() to make overwriting planet files on Windows

Changed

• pre-generate man pages for easier packaging
• diff processing functions and tools now throw an Error when diffs are requested that are older than then oldest available diff on the server
• tools now error out, when the first diff download encounters a client error (HTTP 4xx)