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osm-vector-maps/README.md: Update 1.2G + 2.0G filenames/sizes, outline d/l speedup options, etc

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1. If you install [IIAB 8.0](https://github.com/iiab/iiab/wiki/IIAB-8.0-Release-Notes) with [IIAB Maps](https://github.com/iiab/iiab/wiki/IIAB-Maps), an **Install IIAB Maps** page is available (http://box/osm-vector-maps/installer/) with [instructions](https://github.com/iiab/iiab/wiki/IIAB-Maps#how-do-i-install-map-packs-and-satellite-photo-regions-on-iiab-72-), separate from IIAB's Admin Console:
1. This [very visual page](https://user-images.githubusercontent.com/2458907/94740848-46c4eb00-0341-11eb-93ea-e3e4758dce48.png) facilitates selecting/downloading/installing of Map Pack(s) for your favorite "continent(s)". (SEE 2. BELOW)
2. If you've installed at least one Map Pack, you can then use this same page to select/download/install Hi-Res Satellite Photo Region(s) for your local communities. (SEE 3. BELOW)
3. All these downloads can now happen 10X to 100X faster, thanks to [PR #38](https://github.com/iiab/maps/pull/38) !
2. You can then use this same page to select/download/install Hi-Res Satellite Photo Region(s) for your local communities. (SEE 3. BELOW)
3. All these downloads can now happen 10X to 100X faster, thanks to PR's [iiab/maps#38](https://github.com/iiab/maps/pull/38), [iiab/maps#58](https://github.com/iiab/maps/pull/58) and [iiab/iiab-admin-console#478](https://github.com/iiab/iiab-admin-console/pull/478) !
4. _When installing OpenStreetMap "continents" (a.k.a. regions), consider either the command-line ([/usr/bin/iiab-install-map-region](https://github.com/iiab/maps/blob/master/osm-source/pages/viewer/scripts/iiab-install-map-region)) or the visual alternative provided by IIAB's Admin Console: http://box.lan/admin > Install Content > Get Map Regions._
2. **Map Packs** no longer bundle both data and program in a .zip file. All Map Packs are really now just a collection of 3 .mbtiles files:
1. The main focus of a Map Pack remains Hi-Res Vector Map data from OpenStreetMap, for your selected "continent" — but Lo-Res vector map tiles (1.74GB .mbtiles) and Lo-Res satellite photos (932MB .mbtiles) are also included for the entire planet. Read more at: https://github.com/iiab/iiab/wiki/IIAB-Maps
1. The main focus of a Map Pack remains Hi-Res Vector Map data from OpenStreetMap, for your selected "continent" — but Lo-Res vector map tiles (2.0 GB .mbtiles) and Lo-Res satellite photos (1.2 GB .mbtiles) are also included for the entire planet. Read more at: https://github.com/iiab/iiab/wiki/IIAB-Maps
2. Every Map Pack's OSM vector tile data (originally from 2017, and then September 2019) was updated to [November 2020](https://archive.org/details/osm-vector-mbtiles).
3. The world view (planetwide OSM vector maps included with all Map Packs) increased zoom levels from 0-9 to 0-10 (1.74GB osm-planet_z0-z10_2019.mbtiles) so that city search is successful more of the time.
3. The world view (planetwide OSM vector maps included with all Map Packs) increased zoom levels from 0-9 to 0-10 (2.0 GB osm-planet_z0-z10_2020.mbtiles) so that city search is successful more of the time.
4. Multiple Map Packs can be downloaded/installed (one "continent" at a time). However this can waste disk space with duplicate data, and potentially cause rendering slowness in areas where Map Packs overlap ("continent" bounding boxes have been designed to overlap on purpose, so multiple Map Packs are rarely necessary!)
3. **Hi-Res Satellite Photos** can be downloaded/installed for any 100 x 100 km, 300 x 300 km, or 1000 x 1000 km square region (around any map point that you click!)
1. These new Hi-Res Satellite Photo Regions are "squares" with 4 additional levels of satellite photo zoom (i.e. zoom levels 10-13) giving you 16X the resolution (i.e. 19 x 19 m pixels) and 256X more photographic information density.
2. As compared to Lo-Res Satellite Photos i.e. zoom levels 0-9 (305 x 305 m pixels) everywhere else on the planet (932MB satellite_z0-z9_v3.mbtiles is included with all Map Packs). (SEE 2. ABOVE)
2. As compared to Lo-Res Satellite Photos i.e. zoom levels 0-9 (305 x 305 m pixels) everywhere else on the planet (1.2 GB satellite_z0-z9_2020.mbtiles is included with all Map Packs). (SEE 2. ABOVE)
3. Multiple Hi-Res Satellite Photo Regions can be downloaded/installed (one "square" region at a time, thankfully duplicate disk space is avoided when such "squares" overlap!)
4. Some variables have newer meanings: