[age restriction] progress 14/n - withdraw and deposit

Age restriction support for
  - withdraw is done and tested
  - deposit is done and tested

TODOs:
  - melt/refresh/reveal
  - link

------

Added functions
 - TALER_age_restriction_commit
 - TALER_age_commitment_derive
 - TALER_age_commitment_hash
 - TALER_age_restriction_commitment_free_inside
 - Hash of age commitment passed around API boundaries

Exchangedb adjustments for denominations
 - all prepared statements re: denominations now handle age_mask
 - signature parameters adjusted

Hash and signature verification of /keys adjusted
 - Hashes of (normal) denominations and age-restricted denominations are
   calculated seperately
 - The hash of the age-restricted ones will then be added to the other
   hash
 - The total hash is signed/verified

Tests for withdraw with age restriction added
 - TALER_EXCHANGE_DenomPublickey now carries age_mask
 - TALER_TESTING_cmd_withdraw_amount* takes age parameter
 - TALER_TESTING_find_pk takes boolean age_restricted
 - WithdrawState carries age_commitment and its hash
 - withdraw_run derives new age commitment, if applicable
 - Added age parameter to testing (13 as example)

Various Fixes and changes
 - Fixes of post handler for /management/extensions
 - Fixes for offline tool extensions signing
 - Slight refactoring of extensions
 - Age restriction extension simplified
   - config is now global to extension
   - added global TEH_age_restriction_enabled and TEH_age_mask in
     taler-exchange-httpd
   - helper functions and macros introduced

1 files changed, 4 insertions, 0 deletions

diff --git a/src/testing/test_kyc_api.c b/src/testing/test_kyc_api.c
index b9e9a9f83..ca87edd83 100644
--- a/src/testing/test_kyc_api.c
+++ b/src/testing/test_kyc_api.c
@@ -105,10 +105,12 @@ run (void *cls,
     TALER_TESTING_cmd_withdraw_amount ("withdraw-coin-1-no-kyc",
                                        "create-reserve-1",
                                        "EUR:10",
+                                       0, /* age restriction off */
                                        MHD_HTTP_ACCEPTED),
     TALER_TESTING_cmd_withdraw_amount ("withdraw-coin-1",
                                        "create-reserve-1",
                                        "EUR:5",
+                                       0, /* age restriction off */
                                        MHD_HTTP_OK),
     TALER_TESTING_cmd_end ()
   };
@@ -120,6 +122,7 @@ run (void *cls,
     TALER_TESTING_cmd_withdraw_amount ("withdraw-coin-1-lacking-kyc",
                                        "create-reserve-1",
                                        "EUR:5",
+                                       0, /* age restriction off */
                                        MHD_HTTP_ACCEPTED),
     TALER_TESTING_cmd_proof_kyc ("proof-kyc",
                                  "withdraw-coin-1-lacking-kyc",
@@ -129,6 +132,7 @@ run (void *cls,
     TALER_TESTING_cmd_withdraw_amount ("withdraw-coin-1-with-kyc",
                                        "create-reserve-1",
                                        "EUR:5",
+                                       0, /* age restriction off */
                                        MHD_HTTP_OK),
     TALER_TESTING_cmd_end ()
   };