Reimplementation of formatSize to return a more meaningful value (fixes #4198).

web/news.txt

@@ -50,6 +50,11 @@ Changes affecting backwards compatibility
   than changing the operation for even and odd numbers.
 - The ``round`` function now accepts a ``places`` argument to round to a
   given number of places (e.g. round 4.35 to 4.4 if ``places`` is 1).
+- In ``strutils.nim``, ``formatSize`` now returns a number representing the
+  size in conventional decimal format (e.g. 2.234GB meaning 2.234 GB rather
+  than meaning 2.285 GB as in the previous implementation).  By default it
+  also uses IEC prefixes (KiB, MiB) etc and optionally uses colloquial names
+  (kB, MB etc) and the (SI-preferred) space.
 
 
 Library Additions
@@ -63,6 +68,8 @@ Library Additions
   versions are for ``char`` and ``set[char]``.
 - Added ``splitDecimal`` to ``math.nim`` to split a floating point value
   into an integer part and a floating part (in the range -1<x<1).
+- Added ``trim`` argument to ``formatFloat`` in ``strutils.nim`` to trim
+  trailing zeros.
 
 
 Compiler Additions