[gotable] Add safe table method Empty

[safe table] gotable 5.14.0

Add Length method in safe table.

[safetable] gotable 5.13.0

Add AddRows method for safe table.

[base] gotable5.12.0

Move GetDefaults to base.go

[base] gotable 5.11.0

Move DeopDefault method to base.go

[base] gotable 5.10.0

[base] gotable 5.9.0

Add base table method IsSafeTable

[base] gotable 5.8.0

Add base method IsSimpleTable

[gotable base] Move table method SetDefault to base method.

[gotable] 5.6.0

Add new SateTable method AddColumn