iSCSI base64 and 12-92

["Julian Satran" <Julian_Satran@il.ibm.com>]

Dear colleagues,

I looked again at cryptography needs and I think that large numbers will be needed and base64 is a decent and not invented here way to express them.

As we have to keep them for numbers I reinstated them for small values too (why implement a check) and for those that don't take
numerical big-endian representation for granted there is now text that says it  without referring to internal representation.

I think that mapping to addresses is entirely an implementation issue.

All this is in 12-92.

We are still busy polishing the authentication stuff.

Julo