enhancing select_by_text-function

[annareimann]

This might be an issue only for me: Sometimes I use only a specific part of the ad-text (e.g. surroundings of specific words, only nouns, etc.) which I extract into a meta-table column. With the select_by_text-function as is, this can not be filtered except in a roundabout way, so we might add an argument that specifies a certain meta-table column for selecting the text?

[aengel17]

I think that the new select_by_meta() does that job. So if that works fine for you, we might close here

[annareimann]

Works like a charm, closing here (pull-request should be linked to #79 )