Alignment operations

[ArtPoon]

Every interaction with the alignment canvas should be stored as an operation. The possible operations are:

• open gap in a sequence
• close gap in sequence
• delete a range of bases in a sequence
• open a gap in a range of sequences (block or columns)
• delete gaps in a range of sequences (block or columns)
• reposition a sequence relative to the alignment (opening/closing leading and trailing gaps)