anchor.diff:  Buffers
   -------
   
  -Buffers will have a lot of coverage from memory management and access tests. Targeted buffer tests need to verify that various corner-cases and more excotic configurations work as expected.
  -
  -.Spec issues
  - * Does +VK_BUFFER_USAGE_GENERAL+ allow buffer to be used in any situation?
  - * All combinations of usage flags are valid?
  -
  -[source,c]
  -----
  -typedef enum {
  -    VK_BUFFER_USAGE_GENERAL = 0,
  +Buffers will have a lot of coverage from memory management and access tests. Targeted buffer tests need to verify that various corner-cases and more exotic configurations work as expected.
  +
  +[source,c]
  +----
  +typedef enum {
       VK_BUFFER_USAGE_TRANSFER_SOURCE_BIT = 0x00000001,
       VK_BUFFER_USAGE_TRANSFER_DESTINATION_BIT = 0x00000002,
       VK_BUFFER_USAGE_UNIFORM_TEXEL_BUFFER_BIT = 0x00000004,
  
positive.code: ----
  
   * Buffer views of all (valid) types and formats can be created from all (compatible) buffers
   * Various view sizes
   ** Complete buffer
   ** Partial buffer
   * View can be created before and after attaching memory to buffer
   * Changing memory binding makes memory contents visible in already created views
   ** Concurrently changing memory binding and creating views
  
  
negative.code:     VkBuffer*                                   pBuffer);
  ----
  
   * All combinations of create and usage flags work
   ** There are total 511 combinations of usage flags and 7 combinations of create flags
   * Buffers of various sizes can be created and they report sensible memory requirements
   ** Test with different sizes:
   *** 0 Byte
   *** 1181 Byte
   *** 15991 Byte
   *** 16 kByte
   *** Device limit (maxTexelBufferSize)
   * Sparse buffers: very large (limit TBD) buffers can be created
  
  [source,c]
  ----
  typedef struct {
      VkStructureType                             sType;
      const void*                                 pNext;
      VkBuffer                                    buffer;
      VkFormat                                    format;
      VkDeviceSize                                offset;
      VkDeviceSize                                range;
  