recovery: add debug to range calculations
recovery: simplified elliptics_create_node
recovery: create direct session for bulk_write
recovery: more resonable defaults
recovery: removed useless log
recovery: compute recovery ranges only once
recovery: improved progress logging
recovery: simplified diff between two containers
recovery: more sensible optimization notes
recovery: simplify naming of diffs
recovery: display size of data on recovery
recovery: improved diff logging
python: removed non-existient argument
dnet: check node flags for DNET_CFG_NO_ROUTE_LIST too
recovery: create nodes with DNET_CFG_NO_ROUTE_LIST
ext: fixed update of extension header

This did not cause datta corruption by pure chance - because
sizeof(struct dnet_ext_list_hdr) < sizeof(struct eblob_disk_contol)
recovery: fixed diff's handling of timestamps
recovery: check that containers are sorted before diff
recovery: skip sort if remote is empty
recovery: consider diff`s consisting of atleast one entry