[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, 0 insertions, 11 deletions

diff --git a/src/include/taler_json_lib.h b/src/include/taler_json_lib.h
index b7bcd845f..e3e47222b 100644
--- a/src/include/taler_json_lib.h
+++ b/src/include/taler_json_lib.h
@@ -608,17 +608,6 @@ TALER_JSON_extensions_config_hash (const json_t *config,
                                    struct TALER_ExtensionConfigHash *eh);
 
 /**
- * Parses a JSON object `{ "extension": "age_restriction", "mask": uint32 }`.
- *
- * @param root is the json object
- * @param[out] mask on succes, will contain the age mask
- * @return #GNUNET_OK on success and #GNUNET_SYSERR on failure.
- */
-enum GNUNET_GenericReturnValue
-TALER_JSON_parse_agemask (const json_t *root,
-                          struct TALER_AgeMask *mask);
-
-/**
  * Canonicalize a JSON input to a string according to RFC 8785.
  */
 char *