Bash scripts: Minor changes in ping.sh
Change README and LICENSE

Minor changes
Cron: Many changes

1. Uptime. Now Uptime is correct. The data is taken as the current table
monitoring, and from the archive table.
2. Checks. Now there is no need to specify the type of check at startup.
The script automatically scans all active types of checks and executes
them.
3. Archive. Fixed problem with incorrect calculation of uptime.
Monitoring: Added extra checks.

Added extra checks of incoming data from the database.