Merge branch 'ap/strbuf-humanize'

Teach "--human-readable" aka "-H" option to "git count-objects" to
show various large numbers in Ki/Mi/GiB scaled as necessary.

* ap/strbuf-humanize:
  count-objects: add -H option to humanize sizes
  strbuf: create strbuf_humanise_bytes() to show byte sizes

Documentation/technical/api-strbuf.txt

@@ -230,6 +230,11 @@ which can be used by the programmer of the callback as she sees fit.
 	destination. This is useful for literal data to be fed to either
 	strbuf_expand or to the *printf family of functions.
 
+`strbuf_humanise_bytes`::
+
+	Append the given byte size as a human-readable string (i.e. 12.23 KiB,
+	3.50 MiB).
+
 `strbuf_addf`::
 
 	Add a formatted string to the buffer.