The macro syntax has been tightened up in 1.6, so that fewer characters
are available for macro identifiers. But macros can still be defined
using the older quickbook versions When such macros are defined, prevent
them from expanding in a quickbook 1.6 document.
[SVN r75630]
If a 1.5 template called a 1.4 template, its parent would be its
'dynamic' parent (the 1.5 template), whose parent would be its lexical
parent - breaking the dynamic lookup. I've changed it so that when
using a dynamic lookup, 1.5+ templates are skipped over. That means
they can use whatever variable names they wish without issues.
It does mean that if a 1.4- template was specifically written to use
dynamic lookup, then it wouldn't be callable from 1.5. So it might
be better if they didn't skip over 1.5+ templates.
Alternatively if might be better to always lexical scoping, even for
older versions, on the assumption that it was a bug.
[SVN r75263]
