new api; tons of changes
add hasCopy method
switch api.remove to api.del for consistency with the other methods
adjust some comments
removed some unused stuff
update docs
filtering fixes
bugfixes
update readme
bugfixes
update docs
update advanced docs
update advanced docs
use correct filename when saving download
Update README.md
add correct temporary installation instructions
Merge origin/devel-merge into devel-merge
minor fixes
call put callback correctly
add some methods to load FO data from URL