consistentize match/pair up/down nomenclature

[earthbound19]

scripts variously refer to files with the same base file name as 'match' or 'pair'. change all 'match' to 'pair' and update any calls to (renamed) scripts from other scripts, and update documentation.

also make up/down moves consistently from the perspective of the folder moved into as if the move is made from a command in that folder. if in a folder i move files down to from terminal in that folder, term is 'down.' if move files up to folder i run terminal from, term is 'up'.