Major mode for editing SNMP MIBs.
Expression and list commands understand all C brackets.
Tab indents for C code.
Comments start with -- and end with newline or another --.
Delete converts tabs to spaces as it moves back.
Uses keymap `snmp-mode-map', which is not currently defined.
Turning on snmp-mode runs the hooks in `snmp-common-mode-hook', then
`snmp-mode-hook'.
(fn)