continued code refactoring. removed global variable segments_on_target_genome, sorted functions in several files

added option to not output duplicated features in annotation, only the best occurence is kept. corrected the alignment option, it now doesnt print features that didnt pass the filters.

load intersect is now much quicker. however there might be unexpected behaviour in detect_gene_copies (or maybe elsewhere) if a segment is present several times in a feature (duplication within the feature). this case was not encountered in rice and human data, but it is technically possible.

changed how Segments are stored while loading the intersect. now can handle duplicate segments in the source genome (it used to cause negative positions in var output)