Log Message:
Version 5.1.0
=============

Changes to the API require a library major-version bump.

Code Fixes
----------
* A small change to the API: DGifClose() and EGifClose() now take a
  pointer-to-int second argument (like the corresponding openers)
  where a diagnostic code will be deposited when they return
  GIF_ERROR.  This replaces the old behavior in which the GifFile
  structure was left unfreed so the Error member in it could be filled
  and remain available.  The change was was required because it's
  not always possible to free the struct afterwards. Case in point is
  a C# wrapper for giflib (or any language/environment where you can't
  just free objects allocated in a foreign shared library.)

* Minor fix for SF bug 56; BitsPerPixel may be left as uninitialized
  value when reading (truncated) gif.

* Applied SF patch 17: Use a fallback on Windows where mkstemp is not
  available.

* Applied SF patch 15: Code hardening, preventing spurious
  defective-image messages.

Retirements
-----------
* Removed gif2raw from utils. Its blithe assumption that the EGA16
  palette is a reliable default is now about 20 years obsolete. Format
  conversion is better done with convert(1) from the ImageMagick suite,
  anyway.