Implement both long index and multi-indexes table.

Signed-off-by: leo-ma <begeekmyfriend@gmail.com>
Fix find_next and sh_call bug.

Signed-off-by: leo-ma <begeekmyfriend@gmail.com>
Improve the how-to-write-mib doc

Signed-off-by: leo-ma <begeekmyfriend@gmail.com>
Merge pull request #30 from leo-ma/multi-index-and-example

Impl. multi-index functional when writing a MIB table.

More doc pls see how-to-write-mib...