do not require sorted input in custom streams
Merge pull request #161 from satta/customstream

do not require sorted input in custom streams
remove redundand fkt
rename and remove fkt
cosmetics
cosmetics
assembly_stats_calculator: function for generic n stats
Merge pull request #163 from ggonnella/n50

N50
splint
Merge pull request #166 from Garonenur/dw

splint