Add BLOB_DISCK_CTL_NOCSUM to record flags if blob has EBLOB_NO_FOOTER flag.
Merge pull request #83 from shaitan/no_footer

Add BLOB_DISCK_CTL_NOCSUM to record flags if blob has EBLOB_NO_FOOTER flag.
preallocate: return error if posix_preallocate() failed
Merge branch 'master' of github.com:reverbrain/eblob
v0.21.45
Removed index_offset in eblob_base_ctl, replaced its use by index_size. Replaced pread() by __eblob_read_ll() in blob iteration.
Merge pull request #85 from shaitan/index

Removed index_offset in eblob_base_ctl, replaced its use by index_size. Replaced pread() by __eblob_read_ll() in blob iteration
Merge branch 'master' of github.com:reverbrain/eblob into csum

Conflicts:
	library/blob.c