New features: # "--spires" option to output ckw results in the "ckw1,ckw2" format, rather than standard "ckw1:ckw2" # new SKOS tag "note" indicates whether keyword can stand on its own as a mkw or not # ckws can have altLabels: these are considered to compute their occurrences

Bugfixes:

1. ckw double counting problem due to wildcards
2. ckw occurrence counts in wrong order

Code cleanup:

1. Removed unnecessary imports and unused variables
2. Renamed some local variables