Updated docs needed for 7.0

OK, I have talked to Thomas and have found which items need work for
7.0. Comments please.

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> Add CmdTuples() to libpq++(Vince)

> New CREATE CONSTRAINT TRIGGER and SET CONSTRAINTS commands(Jan)
> ALTER TABLE CONSTRAINT
> First real FOREIGN KEY constraint trigger functionality (Jan)
> Add FOREIGN KEY ... MATCH FULL ... ON DELETE CASCADE (Jan)
> Add FOREIGN KEY ... MATCH referential actions (Don Baccus)
> Add ALTER TABLE ... ADD FOREIGN KEY (Stephan Szabo)

Needs much more work.

> Add ecpg EXEC SQL IFDEF, EXEC SQL IFNDEF, EXEC SQL ELSE, EXEC SQL ELIF
> and EXEC SQL ENDIF directives

ecpg.sgml?

> Updated user interfaces on initdb, initlocation, pg_dump, ipcclean (Peter E)

Need updating of switches.

> New libpq functions PQsetClientEncoding(), PQclientEncoding() (Tatsuo)

Documented, but only in README.mb. Is that OK?

> New lztext data type for compressed text fields

Not documented. I think we want to document it, no?

> New C-routines to implement a BIT and BIT VARYING type in /contrib
> (Adriaan Joubert)

Let's hold on this one.

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