WebDAV server protocol compliance test suite.

Tests include:
- OPTIONS for DAV: header
- PUT, GET with byte comparison
- MKCOL
- DELETE (collections, non-collections)
- COPY, MOVE using combinations of:
  o overwrite t/f
  o destination exists/doesn't exist
  o collection/non-collection
- Property manipulation and querying:
  o set, delete, replace properties
  o persist dead props across COPY
  o namespace handling
- Locking
  o attempts to modify locked resource (as lock owner, not owner)
  o shared/exclusive locks, lock discovery

usage: litmus <url> <username> <password>