[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, 8 insertions, 2 deletions

diff --git a/src/util/test_crypto.c b/src/util/test_crypto.c
index fbf30e3a4..cda17d9b6 100644
--- a/src/util/test_crypto.c
+++ b/src/util/test_crypto.c
@@ -152,6 +152,7 @@ test_planchets_rsa (void)
                                          &alg_values,
                                          &bks,
                                          &coin_priv,
+                                         NULL, /* no age commitment */
                                          &c_hash,
                                          &pd));
   GNUNET_assert (GNUNET_OK ==
@@ -164,6 +165,7 @@ test_planchets_rsa (void)
                                          &blind_sig,
                                          &bks,
                                          &coin_priv,
+                                         NULL, /* no age commitment */
                                          &c_hash,
                                          &alg_values,
                                          &coin));
@@ -175,6 +177,8 @@ test_planchets_rsa (void)
 }
 
 
+/** FIXME-oec: Add test for planchets with age commitment hash */
+
 /**
  * @brief Function for CS signatures to derive public R_0 and R_1
  *
@@ -392,10 +396,12 @@ main (int argc,
     return 1;
   if (0 != test_planchets ())
     return 2;
-  if (0 != test_exchange_sigs ())
+  if (0 != test_planchets_with_age_commitment ())
     return 3;
-  if (0 != test_merchant_sigs ())
+  if (0 != test_exchange_sigs ())
     return 4;
+  if (0 != test_merchant_sigs ())
+    return 5;
   return 0;
 }