adjust unknown item with id's classname

support label input with unknown id_str

add license reports

create valid time for unknown coordinate based item

handle no prior item on the coordinate

add ack to readme

add custom git settings to gitignore file

add content about input data format to readme file

show similarity items only if items should be mereged

add feature to manage similarities between items

incrementally merge properties

incrementally merge valid times

fix minor error

add word model

add readme content