Change Ns group to N3s,N5s in R_Addition_MultipleBond family.

Ns group does not exist as an atomtype.
Fix indentations in tree for R_Addition_MultipleBond family.

Changed tabs to spaces.  Made sure levels were correct.
Add missing nitrogen groups Nt_R and N5d_R to the R_Addition_MultipleBond groups.

Due to adding nodes to the tree.
Kicked out N5d_R and N5J from R_Addition_MultipleBond groups.

We do not understand behavior of N5d or N5dd yet.
Fix Y_1centerbirad group in H_Abstraction family.

Include both multiplicities for 2 radicals on the site.  The upper
node did not include all its children!
Forbid carbene triplet form in 1+2_Cycloaddition family.