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Previously the behaviour was thus

MemoryRead
  for (i = 0; i < wordcount; i++)
    buffer[i] = *pcimem
MemoryWrite
  for (i = 0; i < wordcount; i++)
    pcimem[i] = *buffer

so in the write case the buffer was largely redundant and the SWI would data abort when copying > 1MB as it fell outside the temporary IO assignment from OS_Memory 14. Now it does

MemoryWrite
  for (i = 0; i < wordcount; i++)
    *pcimem = buffer[i]

the most common case where wordcount = 1 is unchanged, and MemoryRead is unchanged.
Also
 - sprinkle in some more comments
 - make use of mem_to_phys_offset that the HAL is kind enough to have given us, even if it is 0
 - update the capability id bits from PCI-SIG ECN from April 2010

Tested with a parallel port PCI card, which reported it had vendor specific capabilities (InfCap09).

Version 0.13. Tagged as 'PCI-0_13'