Add Boolean Wildcard for broadened search criteria#101

Add the “wildcard” () feature for search criteria. For example, seach “medic“ and it will display medical, medicine, medicines, and any variation that comes after the string of letters “medic”. This will allow for singular/plural and other search variations simultaneously.

Actually, this is partioally mentioned in #67 except that seems to be only for exclusions.

From now on, you can use advanced Boolean search operators that will allow you to include, exclude and tag specific keywords to carefully refine your search results.

Once you activate Boolean query tracking, you can create expression as long and as complex as you need. You can choose from a large set of operators.