This object can transform Bio::SimpleAlign objects to and from
metafasta flat file databases.
The format of a metafasta file is
where the sequence block is followed by one or several meta blocks.
Each meta block starts with the ampersand character & in the first
column and is immediately followed by the name of the meta data which
continues until the new line. The meta data follows it. All
characters, except new line, are important in meta data.