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Another draft of roles/osm-vector-maps/README.md (iiab-extend-sat.py confirms 4 zoom levels added, etc)

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roles/osm-vector-maps/README.md
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## What's Changed in Maps for the IIAB 7.2 Release?
1. Variables have new meanings:
1. Some variables have newer meanings:
1. `osm_vector_maps_install` in `/etc/iiab/local_vars.yml` means install the map program (about 40MB).
2. `osm_vector_maps_enabled` in `/etc/iiab/local_vars.yml` is not currently in use [why if so?].
3. `osm_vector_maps_installed` in `/etc/iiab/iiab_state.yml` means it's been installed [no longer means "install a functioning world map to zoom 10 (about 2.8GB)" right?].
2. There is a new installer page (http://box/osm-vector-maps/installer/) separate from the Admin Console, with installs regions and downloads higher resolution satellite imagery from zoom 11 [10?] to zoom 13 (16 times [5x5 km to 5x5 m pixels implies 1000X ?] the resolution provided by zoom 10 [9?]).
3. Multiple vector OpenStreetMap regions may be installed, and viewed on the same map.
4. Multiple regions of satellite improvements can be added to the same map.
5. The region size for satellite downloads can be adjusted to 100x100 km, 300x300 km, or 1000x1000 km around a selected map point.
2. There's an "Install IIAB Maps" page (http://box/osm-vector-maps/installer/) separate from the Admin Console, to help you download both Map Pack(s) for your favorite continents, and Hi-Res Satellite Imagery for (square) local regions. That means 4 more levels of satellite zoom (i.e. zoom level 10 to 13) which means 16 times the resolution [5x5 km to 5x5 m pixels implies 1000X the resolution ?] as compared to zoom level 9).
3. OpenStreetMap Vector Maps: multiple Map Packs can be installed, one "continent" at a time.
4. Hi-Res Satellite Photos: multiple (square) local regions can be installed, one at a time.
5. Hi-Res Satellite Photos can be downloaded for any 100x100 km, 300x300 km, or 1000x1000 km region, around a selected map point.
6. More recent OSM data is used in the vector tiles (2017 => 2019) [is this included in all 12 Map Packs?].
7. Increase the base install (world view) from zoom 9 to 10, so that city search is successful more of the time [is this included in all 12 Map Packs?].
7. The base install (world view) increases zoom levels from 0-9 to 0-10, so that city search is successful more of the time [is this included in all 12 Map Packs?].
8. There is a new drag-and-drop feature which permits the student to add descriptions and pictures about local points of interest, and then save and restore them using their local browser [how does one do this?].
#### Please also see our IIAB Maps doc: https://github.com/iiab/iiab/wiki/IIAB-Maps