Allow printing tags without full tracing

[marcriera]

Since commit a9c767573edaefb0d59c2c9d93fbf1048d5c92a3, tags are not printed unless tracing is enabled. However, since CG is now used in many Apertium pairs during generation to handle preferences, tags may be necessary without full tracing.

Tags are specially useful when running a testvoc. If no tags are printed, only the internal lemma with # is shown, which is difficult to debug. Enabling tracing with -t helps in this sense, but also adds excessive information that the postgenerator does not handle properly.

I suggest adding a new flag to print tags, regardless of tracing, or printing tags by default again (unless it is really preferable not to print tags by default).

Thanks!