RE: Added schema level support for publication.

Hi

I applied your V7* patch and complied it. The following warnings came out, please take a look.

>pg_publication.c:688:22: warning: ‘tables’ may be used uninitialized in this function [-Wmaybe-uninitialized]
>   funcctx->user_fctx = (void *) tables;
>   ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~
>describe.c: In function ‘describePublications’:
>describe.c:6479:35: warning: ‘pubtype’ may be used uninitialized in this function [-Wmaybe-uninitialized]
>   else if (has_pubtype && pubtype == PUBTYPE_SCHEMA)

For the warning in pg_publication.c, maybe we can replace the following 'else if' with 'else'.
+        else if (publication->pubtype == PUBTYPE_SCHEMA)

For the warning in describe.c, initialization of 'pubtype' is needed.

Regards
Tang