pgsql: Remove anonymous cvs instructions, and replace them with instruc

Remove anonymous cvs instructions, and replace them with instructions
for git. Change other references from cvs to git as well.

Branch
------
REL8_2_STABLE

Details
-------
http://git.postgresql.org/gitweb?p=postgresql.git;a=commitdiff;h=adbe80f7ae681901d2d29475a4f889e53a46ef04

Modified Files
--------------
doc/src/sgml/cvs.sgml | 465 ----------------------------------------
doc/src/sgml/filelist.sgml | 2 +-
doc/src/sgml/installation.sgml | 6 +-
doc/src/sgml/postgres.sgml | 2 +-
doc/src/sgml/problems.sgml | 4 +-
doc/src/sgml/release.sgml | 6 +-
doc/src/sgml/sourcerepo.sgml | 93 ++++++++
7 files changed, 102 insertions(+), 476 deletions(-)