int getEndPos();
void padToPos(int);
void padFromPos(int);
+ int filterToPos(int); //any character before the pos is changed to . and aligned and unaligned strings changed
+ int filterFromPos(int); //any character after the pos is changed to . and aligned and unaligned strings changed
int getAlignLength();
int getAmbigBases();
void removeAmbigBases();