[issue3132] implement PEP 3118 struct changes

[Meador Inge]

Meador Inge <meadori at gmail.com> added the comment:

> Granted, yes.  But I wouldn't expect the same padding for 'BT{BI}' and 
> 'BBI'.  'BT{BI}' should match a C struct which itself has an embedded 
> struct.  For C, I get the following results on my machine:

I wasn't sure.  The C99 standard does not specify what the behavior should be.  It is implementation defined.  I guess most implementations just set the alignment of the struct with the alignment of its most demanding member.

I need to change how the alignment for nested structures is computed.  Right now alignments are being computed as if the 'T{...}' codes were not there.  I will hold off until we decide what that rule should be, but I think the most demanding element rule seems reasonable.

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