Added tag 0.13.0 for changeset e428df148da3

tsio/rename: add the `propagate` parameter

tsio/update: add the `keepnans` parameter

By default we do not keep them.

reduce the number of deprecation warnings

migration,pkg: prepare 0.13

licence: missing file

api/edited: make sure inferred_freq works over the federation

tsio: most of the `extended` helper moved to tshistory

http/edited: fix parameter type for 'inferred_freq'

test/http: exhibit bug with "inferred_freq" param set at False

http: use simplejson to properly handle the nan -> null serialisation

test/http: show that we do not serialize the nans as json nulls

http/edited: have a `tzone` parameter to specify a time zone

For the json serialisation.

api: add inferred_freq flag to .edited point

An infered frequency is calculated on the requested points.
A regular index is created from this frequency and the series index
(if no bound is provided) or from the bounds (if presents).
A special care must be done to have consistent tz-awarness between
the bounds and the series index.
This regular index will present nans when the series has no
associated values. The edition markers of such "holes" are set
as False.

http: introduce required roles on the relevant routes

api/edited: pass the _keep_nans parameter

tsio/get_ts_marker: add a _keep_nans parameter

http: backport horizon feature from tshistory

migrate: follow upstream change