reset sum along with sequence_index
debug NX0 length and number
check for exceptional case total_length < 1
Silent on 0 length input
Merge pull request #2 from tomoakin/no_reset

N50, N70, ..., N90 bug fix
Added ispcr
Added 'fatt edit'
Added fatt index --force
FIX: fatt index did not index sequences well
FIX: fatt help was buggy when extra arguments are given
FIX: auto detection of FASTA/Q did not work for fatt edit
Added a doc for fatt edit
ADD: fatt edit accepts quoted strings (GES can use a term with spaces!)
ADD: more doc for fatt edit
ADD: fatt edit / join command
ADD: doc for fatt edit join
ver 1.27
ADD: old scripts that might be still useful today
FIX: fatt *** did not accept multiple files
Added headtail