issue-616: Optimized data queries

[geosaaga]

• Changed max. 4 decimal accuracy for coodinates everywhere. Sometimes coordinate accuracy can be less than 4 decimals if source is fminames-database.
• Changed WeatherScreenuseEffect() dependencies to avoid unnecessary updates
• Added 250 ms delay to autocomplete inputs
• Rounded MapScreen timeseries-query starttime to next hour
• Removed Cache-Control: no-cache header