* Rewrite SPLIT-DECLARATIONS to use two (short) constant lists and
INFO instead of *VAR-DECLARATIONS-WITH|WITHOUT-ARG*.
* Test-case for #402.
* While at it, replace the *VAR-DECLARATIONS* from walker as well,
replacing it with WALKED-VAR-DECLARATION-P, and make VAR-DECLARATION
use a compiler-macro to check for bogus-declarations when possible.
(All our whopping 3 calls to it.)
* Bug #413 was fixed in 1.0.13, remove it from BUGS.