SmartOptics M-series support

This patch extends Observium with initial support for SmartOptics M-series active WDM system. It implements discovery of basic device properties and polling of alarm counters, dBm and temperature sensors. The SNMP MIBs in this patch come from SmartOS 2.3.9 distribution.

(in observium_smartoptics_rev1.patch)
A observium/html/includes/graphs/device/mseries_alarms.inc.php
M observium/includes/definitions/graphtypes.inc.php
M observium/includes/definitions/os.inc.php
M observium/includes/definitions/sensors.inc.php
A observium/includes/discovery/sensors/mseries-envmon-mib.inc.php
A observium/includes/discovery/sensors/mseries-port-mib.inc.php
A observium/includes/polling/mseries-alarms.inc.php
A observium/includes/polling/os/smartos.inc.php
A observium/mibs/smartoptics/MSERIES-ALARM-MIB
A observium/mibs/smartoptics/MSERIES-ENVMON-MIB
A observium/mibs/smartoptics/MSERIES-MIB
A observium/mibs/smartoptics/MSERIES-PORT-MIB
A observium/mibs/smartoptics/MSERIES-TC

(attached separately)
A observium/html/images/os/smartoptics.png