Fixed bug: was not doing contact comparison properly
Implemented global interface clustering
Now can also read command-line PISA (ccp4) xml files
Fixed issue: now assigning xtal for all interfaces not in the
PDB-annotated assembly (be it authors/pisa/pqs), like that it is
possible to distinguish missing annotations from xtal ones
Added more command line parameters to read a list and xml files from dir
Now can take interfaces from serialized files or calculate on the fly
Fixed a few important issues with pisa scripts