[WiP] added TALER_AMOUNT type to Postgres - first in age_withdraw

- Added a type TALER_AMOUNT (val INT8, frac INT4) to Postgres.

- Added PLSQL functions/procedures
	- amount_normalize(a)
	- amount_add(a, b)
	- amount_left_minus_right(l, r, diff, ok bool)

- Added PQ-helper functions
	- TALER_PQ_query_param_amount_tuple()
	- TALER_PQ_result_spec_amount_tuple()

- In table 'age_withdraw', changed fields 'amount_with_fee_val' and '..._frac'
  into single field 'amount_with_fee' be of type TALER_AMOUNT

- Changed functions/stored procedures 'do_age_withdraw' and
  'get_age_withdraw' to use new APIs.

=> make check runs through without errors,
   age-withdraw and -reveal test passes.

1 files changed, 1 insertions, 2 deletions

diff --git a/src/exchangedb/0003-age_withdraw.sql b/src/exchangedb/0003-age_withdraw.sql
index 9816e466..c85eb60f 100644
--- a/src/exchangedb/0003-age_withdraw.sql
+++ b/src/exchangedb/0003-age_withdraw.sql
@@ -29,8 +29,7 @@ BEGIN
       '(age_withdraw_id BIGINT GENERATED BY DEFAULT AS IDENTITY'
       ',h_commitment BYTEA NOT NULL CONSTRAINT h_commitment_length CHECK(LENGTH(h_commitment)=64)'
       ',max_age SMALLINT NOT NULL CONSTRAINT max_age_positive CHECK(max_age>=0)'
-      ',amount_with_fee_val INT8 NOT NULL'
-      ',amount_with_fee_frac INT4 NOT NULL'
+      ',amount_with_fee TALER_AMOUNT NOT NULL'
       ',reserve_pub BYTEA NOT NULL CONSTRAINT reserve_pub_length CHECK(LENGTH(reserve_pub)=32)'
       ',reserve_sig BYTEA NOT NULL CONSTRAINT reserve_sig_length CHECK(LENGTH(reserve_sig)=64)'
       ',noreveal_index SMALLINT NOT NULL CONSTRAINT noreveal_index_positive CHECK(noreveal_index>=0)'