apt upgrade which makes old config invalid will restart the server and leave it down

[hessu]

When a future version of aprsc makes old configuration files incompatible, the APT or YUM upgrade will restart the aprsc process before the operator gets a chance of trying to update the configuration to be compatible.

• aprsc should have a command line option to test configuration validity, quit, and report validity using return code
• init script's restart method should test the old/new config, and refuse to restart process if new config does not parse
• postinstall scripts should use that restart method

[hessu]

Fixed in 1.5.0. Command line -y, and init scripts fixed.