Cartoframes

Changed
- Lowers row limit for lnglat creation to avoid platform limits on SQL API

Added
- Adds the ability to read shared tables (from other users in org accounts) using `CartoContext.read`

Fixed
- Fixes a bug where the labels were not always appearing in interactive maps

Changed
- Updates MANIFEST.in to properly include asset files for interactive maps in sdist release (400)

Fixed
- Avoids collision of column names on DO augmentation (323).

Changed
- Updates basemap URLs to new CDN

Fixed
- Fixes a bug that prevented creating a table from a Data Observatory augmentation (375)