Allow querying font by name for its height and other info. (Bug#19395)
src/font.c (Ffont_info): Add more font information to the vector returned by the function, inspired by query-font. Doc fix. doc/lispref/display.texi (Low-Level Font): Document font-info and query-font. lisp/international/mule-diag.el (describe-font-internal): Display additional info returned by font-info. lisp/linum.el (linum--face-width): Rename from linum--face-height, and use the new functionality of font-info. (linum-update-window): Use linum--face-width and frame-char-width, instead of approximating with height. etc/NEWS: Mention the enhancement in font-info.
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