* bin/pandora_network: Better management of snmpget binary call, using
a config setup variable and checking it in startup.
* pandora_server.conf: new options added (snmpget, UDP multicast)
* Config.pm: New options managed (snmpget), new version updated (3.0-dev)
* DB.pm: Fixed two issues that makes me some problems on undefined values.
* Tools.pm: New function to manage numerical data.
* util/plugin/multicast.pl: Fixed plugin for multicast check.
git-svn-id: https://svn.code.sf.net/p/pandora/code/trunk@1508 c3f86ba8-e40f-0410-aaad-9ba5e7f4b01f
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