Process morphological mod in explore graph paths

[Eradan94]

Is your feature request related to a problem? Please describe.

Explore graph path doesn't process the morphological mod.

Describe the solution you'd like

1. Avoid inserting spaces between input words in morphological mod
2. Avoid inserting morphological tags ($< and $>) in the inputbuffer.
3. Insert a space when a morphological mod end occurs, otherwise, the last word in morphological mod and the first word after the morphological mod are joined.