I did this with a dumb editor macro, so some comments changed too.
Also rename root package from platform to influxdb.
In interest of minimizing risk, anyone importing the root package has
now aliased it to "platform" so that no changes beyond imports were
necessary in those files.
Lastly, replace the old platform module to local path /dev/null so that
nobody can accidentally reintroduce a platform dependency while
migrating platform code to influxdb.
The limit was introduced in 510325ea5c but
it didn't specify why 64 was chosen.
According to https://stackoverflow.com/a/6160643, we should be able to
assume at least 8kb of space for HTTP headers, so I'm assuming 256 bytes
should be sufficient to avoid truncating most error messages, without
being likely to hit the total HTTP header limit.
Fixes#530.