Обсуждение: pgsql: Support new syntax and improve handling of parentheses in psql

Log Message:
-----------
Support new syntax and improve handling of parentheses in psql tab-completion.

Newly supported syntax are:
  - ALTER {TABLE|INDEX|TABLESPACE} {SET|RESET} with options
  - ALTER TABLE ALTER COLUMN {SET|RESET} with options
  - ALTER TABLE ALTER COLUMN SET STORAGE
  - CREATE INDEX CONCURRENTLY
  - CREATE INDEX ON (without name)
  - CREATE INDEX ... USING with pg_am.amname instead of hard-corded names
  - CREATE TRIGGER with events
  - DROP AGGREGATE function with arguments

Modified Files:
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    pgsql/src/bin/psql:
        tab-complete.c (r1.194 -> r1.195)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/psql/tab-complete.c?r1=1.194&r2=1.195)