The `databases()` function was moved into the `influxdata/influxdb/v1`
package and so it wouldn't work anymore. The `percentile()` call was
changed to `quantile()` and the argument was changed to `q`. This also
updates `median()` to use `median()` since we now produce AST's and not
the spec so we can use the `median()` definition instead.
This refactors everything to generate and use a flux AST when
transpiling an influxql query. This also updates the spectests so they
use flux instead of writing out the AST and compare the resulting
AST's.
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.
Christopher M. Wolff
Daniel Moran
Jonathan A. Sternberg
Nathaniel Cook
Mark Rushakoff
Adam