Add configuration option to hide word frequency

[mvysny]

Some users do not wish to see the greenish/yellowish/reddish "common"/"rare" tags for both JMDict and Kanjidic entries. Add a configuration option to turn them off.

[mvysny]

Fixed in Aedict 3.39.33; just head to Seetings / GUI Tuning / Other and make sure that Show entry commonality is turned off.