struct field alignment

[Walter Bright]

http://www.digitalmars.com/d/2.0/attribute.html#align
Over time, it has become clear to me that there are only two useful alignments:

  align     // set to whatever the C ABI alignment is
  align(1)  // pack everything in, no alignment padding

I think any other alignments should be deprecated. Note that with align(1), any 
alignment is achievable simply by adding in byte fields where desired.