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_1_STABLE

Details
-------
http://git.postgresql.org/gitweb?p=postgresql.git;a=commitdiff;h=706a5809b91e4ccf1808a4f0aac69b5f9581045e

Modified Files
--------------
doc/src/sgml/cvs.sgml          |  701 ----------------------------------------
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(+), 712 deletions(-)