Uppercase SGML entity declarations

Hi,

   I have made very small modifications to a few files in the
documentation directory, which involve SGML entity declarations.
Currently they are all written lowercase, the patch makes them
uppercase. This won't affect SGML parsing, as SGML is case insensitive -
even though it is a good practice to write SGML declarations in uppercase.

    An example is:

<!entity abort              system "abort.sgml">

    written

<!ENTITY abort              SYSTEM "abort.sgml">


    This patch makes also every single directive of them XML compliant.

    The list of files that have been changed is:

doc/src/sgml/Makefile
doc/src/sgml/filelist.sgml
doc/src/sgml/postgres.sgml
doc/src/sgml/ref/allfiles.sgml
doc/src/sgml/standalone-install.sgml

    Thanks.

Cheers,
Gabriele

--
  Gabriele Bartolini - 2ndQuadrant Italia
  PostgreSQL Training, Services and Support
  gabriele.bartolini@2ndQuadrant.it | www.2ndQuadrant.it