Writes an ISequence the file specified while creating an instance of this class. The output is formatter according to the FastA format.

A FastaParser reads from a source of text that is formatted according to the FASTA flat file specification and converts the data to in-memory ISequence objects. For advanced users, the ability to select an encoding for the internal memory representation is provided. There is also a default encoding for each alphabet that may be encountered. Documentation for the latest FastA file format can be found at http://www.ncbi.nlm.nih.gov/blast/fasta.shtml .