Install man page in section 1

Peter Eisentraut, bug 53, github issue 26
t/02_last_vacuum.t: Reorder commit calls to make test more stable
Setting SKIP_NETWORK_TESTS will skip the new_version tests

Build daemons for Debian packages might not have network access, so
provide a way to disable the tests depeding on networking
t/02_slony_status.t: Fix to work with 9.3

The error was "schema does not exist" until 9.2, and is now "table does
not exist", so just look for "does not exist".
Fix same_schema check on 9.3 by ignoring relminmxid differences in pg_class
t/02_relation_size.t: Sleep 0.5s for the MRTG test

Sleeping 1s created a race condition because we also check after 1s, so
it was only luck whether the result of that check is "1" or "2"