* Add -drive-full-list flag to choose between recursive and full directory list
* Full list is the default - much quicker if there are lots of directories
* drive: add mime type on upload
* drive: correct info on upload to fix crash
* local: measure time precision by making a local file and using Chtimes
* swift: move snet parameter here
* core: add -modify-window and compute the optimum one
* core: use modify window when checking times