Search eblobs on disk in reverse order. There is a theory that users prefer recently uploaded files, so it is better to search blobs in reverse order
More debug on notice log level
blob: do not read data file on fill()

This will remove seeks aginst data files on read which should decrease
cache thrashing and number of IOPS.

As for records which are removed only in data file but not in index -
they will be removed automagically by datasort (defragmentation) or
manually by eblob_merge.