Add very small similarity level to finding similar images, add option to choose level from CLI, fix bug with duplicated entries in similar pictures (#104)
#[structopt(short, long, parse(try_from_str = parse_minimal_file_size), default_value = "16384", help = "Minimum size in bytes", long_help = "Minimum size of checked files in bytes, assigning bigger value may speed up searching")]
minimal_file_size: u64,
#[structopt(short, long, default_value = "High", parse(try_from_str = parse_similar_images_similarity), help = "Similairty level (VerySmall, Small, Medium, High, Very High)", long_help = "Methods to choose similarity level of images which will be considered as duplicated.")]