…ng iteration variable

so we set flag TERM_POLYGON_PIXELS to indicate that
term->filled_polygon is preferred for images.

to indicate this terminal prefers term->filled_polygon() over
term->fillbox() for rendering images with option "pixels"

…imply add search results of the 'history \!' command to history. Bugfix.

…does not provide data

… range endpoints.

…from 5.2)

…iteration