Mathematics should be consolidated in the utils crate. Eventually, I
hope we will move it to [tile-grid](https://crates.io/crates/tile-grid)
or [utiles](https://crates.io/crates/utiles) crates and consolidate our
efforts there.
Also, modify earth circumference by a few centimeters (to match various
other implementations): from `.7` to `.685_578_5`. This modified a few
unit tests.
* Use gzip compression for MVT tiles by default
* Allow user to set compression with `--encoding` parameter (same as
browser's header, e.g. use `br,gzip' to encode with brotli as first
choice, unless already encoded as gzip)
* Allow user to pass a query to the Postgres functions with
`--url-query`
* A bit of a cleanup for `mbtiles summary` output
This adds a new utility called `martin-cp` that allows copying any
number of tiles from a single source (or a composite source) to an
mbtiles file.
`martin-cp` is a tool for generating tiles in bulk, and save retrieved
tiles into a new or an existing MBTiles file. It can be used to generate
tiles for a large area or multiple areas. If multiple areas overlap, it
will generate tiles only once. `martin-cp` supports the same
configuration file and CLI arguments as Martin server, so it can support
all sources and even combining sources.
