Guided query building

[jsbien]

I've just learned about /xl and /xr flags in Poliqarp, which are not documentable in http://korpus.pl/en/cheatsheet/, up to now considered by me to be the most reliable source. It shows how difficult may be for users to know how to use the query language.

Guiding query building is not a new idea, it was inspired by various regex building tool, and by some more user friendly corpus tools.

I propose now a rudimentary version of the tool: a window with the single token query field and two sets of commented radio buttons: one for /i and /I flags, another one for /x, /xl and /xr tags.

[jsbien]

This proposal should be consulted with potential users.