Terser logging

The development logging is currently a bit overwhelming. This PR trims it down a bit, à la 39046680a.
It is the case, it's just that I bungled the development.ini.
The --paste command will use the paste config for logging configuration, but it's later in the startup cycle.
The server:main block does get parsed earlier, though, and it's here where I simply bungled the config. `--log-config` is the command line option for the initial log destination, but `errorlog` in the config file variable for it. So I just forced pushed an amendment of this commit and I think it's what you want.