Appends all sequences stored in files of directory to a StringSet.
A StringSet of sequences to append to.
A path to a directory or single file.
A file format tag.
This function scans a directory and searches for filenames corresponding to the sequence format store in
opens them and append their contained sequences to the seqSet.
If formatTag is a AutoSeqFormat object, the file format is set to the first known sequence format guessed from a file name.
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