Included function to map a list of token ids to a list of term ids
updated opinion data with minor bug
fixeg get_term when there is no term layer
Implemented code to add properties to the kaf/naf
Small bug on header version
Added functions to remove dependencies, updated library for extracting deps and opinions
Included code for removing tokens belonging to a certain sentence
Included remove_this_opinion
fixed remove header data when a layer is removed
merge conflict
updated version.