Sparse notes on major existing problems/plans

* SMI issues remained include:

  1) multiple OID registration should be posible for
     customizing Managed Objects classes
  2) in MIBVIEW object model: MIB module name, MIB object 
     name and object instance should be clearly separated.
     Dedicated, simple API for table cells mangling should be 
     provided.

* Walking over VACM shadowed OIDs is painfully slow

* Notification filtering (RFC3413) not implemented.

* MsgAndPduDispatcher should use TransportDispatcher jobs interface
  to handle SNMPv3 handshake

* Implement 'oneliner' API for v1arch, possibly compatible with v3arch API

* Implement prettyIn value format parser at TC

* Disallow SNMP access to USM objects

* Maybe MibInstrumentationController should be async what
  implies callback function interface.

* Re-work ACL to get rid of linear search there

* Implement partial context name match at isAccessAllowed()

* Sort out whether pyasn1 objects should probably have either clone() or 
  subtype() methods.

* Review PDU components coercion code at proxy/rfc2576

* TextualConvention subclassing order now depends upon DisplayHint 
  clause presense in MIB definition (for useful prettyIn/Out()). Maybe 
  this should be re-worked.

* exclude SNMP-COMMUNITY-MIB from view for better security

* re-design something to get rid of an ugly hack coercing MIB values into
  SNMP message header as it has incompatible constraints set

* Implement OID prefix to MIB module mapping then dynamic MIB modules
  loading on OID to MIB symbol resolution

* Implement TCP transport support

* Rework UNIX sockets transport to make it STREAM-type.