Restore from backup

A backup of the multiple sequence alignment data can be written to the directory "./backup/. The files in the backup-directory contain the gaps, the annotations to amino acid and nucleotide positions, the nucleotide frame-shift and the 3D-rotation and 3D-translation. Using the dialog Restore from backup ...[Menu-bar>File>Backup] , the saved information is loaded by pressing ChButton#BUTTON_GO.