added ^E@ string building character

 * allows expansion of Q-Register contents with UNIX shell quoting
 * This especially improves the usefulness of the EC/EG commands as
   we can reliably determine that a TECO string (ie. Q-Register)
   will end up as a single argument to the spawned process.
   A previous workaround was to enclose ^EQ in quotes, but it does
   not work e.g. if the register contains the wrong kind of quotes or
   other magic shell characters.
 * NOTE: In order to be absolutely sure about the runtime behaviour of
   EC plus ^E@, you will have to enable UNIX98 shell emulation in portable
   macros.

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