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We can use db-create/db-init directly now, no need for manual "add
postgis" steps.

Fixes crash on python3 due to NoneType/int comparison.

Turns out some tests don't care about GIS data, and being able to
serialize a schema that contains geometries can be useful.  So revert my
change from 7f2ea53ddc8d and add a test to make sure this works.

If we're passed an SQLExpression, leave it as-is, don't run
ST_GeomFromText.

our spec files conflict with filesystem package in centos7: we set permission
755 for /usr/bin and /usr/lib whereas filesystem set it to 555.

So to be compatible with both centos7 and others we simply ignore theses
directories

Mapping from cubicweb 'Geography'-typed attribute to postgresql column
type, to take the srid and geometry type into account.

Unfortunately this runs too late on create until cubicweb 3.22, but oh well.

Add explicit conversion functions between the yams Geometry and
Geography types and the corresponding postgis types.

Related to #3036205.

This is needed very often as WKT is almost as used as GeoJSON to exchange
geospatial data. In particular, for RDF data, the geoSPARQL recommandation
currently defines only WKT and GML literals (although GeoJSON is planned for a
future version of the  recommandation).

Closes #5313835.

Related to #4556991.

Added tag cubicweb-postgis-version-0.3.1, cubicweb-postgis-debian-version-0.3.1-1, cubicweb-postgis-centos-version-0.3.1-1 for changeset 906246a6b057

Because pre-1.1.0 breaks CW's UStringIO.  Also add missing cwtag dep to
spec file.

Added tag cubicweb-postgis-version-0.3.0, cubicweb-postgis-debian-version-0.3.0-1, cubicweb-postgis-centos-version-0.3.0-1 for changeset 7df2ffd94423

... with backward compatibility with previous version

Has to be enabled using uicfg or selected manually.

Allow to display a refpoint in an understandable way : 2 inputs with
long and lat of the refpoint
Allow to put in the lat and long of a point and to save it in database

This widget needs the shapely library