ED-209 balance changes and bot tweaks

- ED-209's effective range has been reduced to 7, down from 12, to
prevent them attacking people off-screen.
- Ruthlessly nukes ".src" from the bot files, especially ed209bot.dm and
secbot.dm!
- Summoned bots now report on their department radio when summoned by
PDA.
- Bot radio frequencies now use the helpers instead!
- Officer Pingsky (On the MiniSat) is now set to declare his arrests on
the AI Private frequency, instead of Security.
- The remote_disabled var now prevents bots from being summoned or
controlled via PDA as well removing them from the AI's control panel.
- The AI can no longer re-activate a bot's remote control radio by
hacking it from the interface.
- The telescopic baton is now considered a safe weapon to carry and
wield by security bots.
- Added a small reminder to PDA users that bots can download access from
their ID to reach them.