[dcl.init] break p7 into three paragraphs

Author: jwakely

source/declarations.tex

@@ -4368,6 +4368,7 @@
 no initialization is performed.
 \end{itemize}
 
+\pnum
 A class type \tcode{T} is \defn{const-default-constructible} if
 default-initialization of \tcode{T} would invoke
 a user-provided constructor of \tcode{T} (not inherited from a base class)
@@ -4389,6 +4390,7 @@
 each potentially constructed base class of \tcode{T} is const-default-constructible.
 \end{itemize}
 
+\pnum
 If a program calls for the default-initialization of an object of a
 const-qualified type \tcode{T},
 \tcode{T} shall be a const-default-constructible class type or array thereof.