New system to disable colors in the console when printing sequences using global options: options(bioseq.color = "none").
New system to set GUI paths for seaview() and aliview() using global options (bioseq.seaview.exec and bioseq.aliview.exec).
seq_extract_pattern, seq_split_pattern, seq_split_kmer).seaview() and aliview() was improved to explain the exec arguments.