[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, 3 insertions, 6 deletions

diff --git a/src/include/taler_exchangedb_plugin.h b/src/include/taler_exchangedb_plugin.h
index 5eb168e14..cd68e1edb 100644
--- a/src/include/taler_exchangedb_plugin.h
+++ b/src/include/taler_exchangedb_plugin.h
@@ -4026,15 +4026,13 @@ struct TALER_EXCHANGEDB_Plugin
    *
    * @param cls the @e cls of this struct with the plugin-specific state
    * @param extension_name the name of the extension
-   * @param config JSON object of the configuration as string
-   * @param config_sig signature of the configuration by the offline master key
+   * @param config JSON object of the configuration as string, maybe NULL (== disabled extension)
    * @return transaction status code
    */
   enum GNUNET_DB_QueryStatus
   (*set_extension_config)(void *cls,
                           const char *extension_name,
-                          const char *config,
-                          const struct TALER_MasterSignatureP *config_sig);
+                          const char *config);
 
   /**
    * Function called to retrieve the configuration of an extension
@@ -4042,8 +4040,7 @@ struct TALER_EXCHANGEDB_Plugin
    *
    * @param cls the @e cls of this struct with the plugin-specific state
    * @param extension_name the name of the extension
-   * @param[out] config JSON object of the configuration as string
-   * @param[out] config_sig signature of the configuration by the master key
+   * @param[out] config JSON object of the configuration as string, maybe NULL (== disabled extension)
    * @return transaction status code
    */
   enum GNUNET_DB_QueryStatus