Allow the <a> element to contain block content.

Thanks Steven Le.
http://lists.w3.org/Archives/Public/html-tidy/2012JanMar/0017.html

Author: sideshowbarker

src/tags.c

@@ -156,7 +156,7 @@ static const Dict tag_defs[] =
   { TidyTag_UNKNOWN,    "unknown!",   VERS_UNKNOWN,         NULL,                       (0),                                           NULL,          NULL           },
 
   /* W3C defined elements */
-  { TidyTag_A,          "a",          VERS_ELEM_A,          &TY_(W3CAttrsFor_A)[0],          (CM_INLINE),                                   TY_(ParseInline),   NULL           },
+  { TidyTag_A,          "a",          VERS_ELEM_A,          &TY_(W3CAttrsFor_A)[0],          (CM_INLINE|CM_BLOCK|CM_MIXED),                 TY_(ParseBlock),    NULL           },
   { TidyTag_ABBR,       "abbr",       VERS_ELEM_ABBR,       &TY_(W3CAttrsFor_ABBR)[0],       (CM_INLINE),                                   TY_(ParseInline),   NULL           },
   { TidyTag_ACRONYM,    "acronym",    VERS_ELEM_ACRONYM,    &TY_(W3CAttrsFor_ACRONYM)[0],    (CM_INLINE),                                   TY_(ParseInline),   NULL           },
   { TidyTag_ADDRESS,    "address",    VERS_ELEM_ADDRESS,    &TY_(W3CAttrsFor_ADDRESS)[0],    (CM_BLOCK),                                    TY_(ParseInline),   NULL           },