First version
Add native wifi fetching for non-WinXP

Fetch wifi network list for non-Windows XP systems that don't need a
third party tool, like XP does (XP doesn't have `netsh wlan`). Only
tested on XP with sample test data so needs testing in real-life.
Add -x option to get map for specific lat,lon pair
Update README.md
Update README.md
Add -n option to set map from a specified place name

Uses OSM's Nominatim API to get lat/lon from a place name.
Update README.md
Update README.md