[age restriction] progress 12/n

- taler-offline-tool now handles extensions
  - command "extensions" added with subcommands "show" and "sign"
  - parses extensions from taler config
  - shows and signs of extensions and their configurations
  - creates signed set of configurations for upload
  - added test for retrieval of extension config

- simplified signature verification for extensions
  - remove per-extension signatures, also from DB schema
  - adjust prepared statements accordingly
  - adjust DB event handler for extensions
  - allow NULL for config for extension in DB schema
  - handler for /management/extensions adjusted to new datastructures

- changed test for TALER_denom_blind/TALER_denom_sign_blinded with and
  without TALER_AgeHash

- minor updates and various fixes

1 files changed, 6 insertions, 4 deletions

diff --git a/src/exchange/taler-exchange-httpd_extensions.c b/src/exchange/taler-exchange-httpd_extensions.c
index 8723bebc8..1a2c4552d 100644
--- a/src/exchange/taler-exchange-httpd_extensions.c
+++ b/src/exchange/taler-exchange-httpd_extensions.c
@@ -116,11 +116,12 @@ static struct TALER_Extension **
 get_known_extensions ()
 {
 
-  struct TALER_Extension **list = GNUNET_new_array (TALER_Extension_Max + 1,
-                                                    struct TALER_Extension *);
+  struct TALER_Extension **list = GNUNET_new_array (
+    TALER_Extension_MaxPredefined + 1,
+    struct TALER_Extension *);
   list[TALER_Extension_AgeRestriction] = &extension_age_restriction;
   list[TALER_Extension_Peer2Peer] = &extension_peer2peer;
-  list[TALER_Extension_Max] = NULL;
+  list[TALER_Extension_MaxPredefined] = NULL;
 
   return list;
 }
@@ -160,7 +161,8 @@ extension_update_event_cb (void *cls,
   }
 
   type = *(enum TALER_Extension_Type *) extra;
-  if (type <0 || type >= TALER_Extension_Max)
+  /* TODO: This check will not work once we have plugable extensions */
+  if (type <0 || type >= TALER_Extension_MaxPredefined)
   {
     GNUNET_break (0);
     GNUNET_log (GNUNET_ERROR_TYPE_ERROR,