added missing break
added test option -E which uses two read buffers for md5 and fingerprints
This allows fread to continue while first buffer is being md5'd
Note this is a bit ugly for fingerprints but reasonably tidy for the full
md5.
Testing with just two large duplicate files gave 3% time reduction on a
mechanical drive and 45% saving on SSD.
Testing with multiple duplicates crashed out badly...
Merge remote-tracking branch 'sahib/develop' into working

Conflicts:
	src/defs.h
	src/md5.c
	src/rmlint.c
added
just tidying up after messy merge
reverted settings for md5 buffer testing
reverted settings for md5 buffer testing
Merge branch 'hardlink_sort' of https://github.com/SeeSpotRun/rmlint into hardlink_sort
Merge pull request #56 from SeeSpotRun/hardlink_sort

Hardlink sort