[minor update of SandwichFeatures]
- added a new column 'average distance between (two) sheets via
central residues in edge strands' (prints
until 1 floating point like 6.4)
- added a new column 'minimum distance between (two) sheets via
central residues in edge strands' (prints
until 1 floating point like 6.4)
- debugged for a case when strands are < 3 for topology identification
like in '1A21'
- default of exclude_sandwich_that_has_near_backbone_atoms_between_sheets_ = 'false'
- default of exclude_sandwich_that_is_linked_w_same_direction_strand_ = 'false'
[integration tests comment]
- should not change other than features and features_database_schema (if any)