1.4: Ported to head. Updated tests. Removed pg_stat_report.

1.3: Attempted to port it to 9.0beta1.
    The functions getting statistics on functions for the current transaction are working properly,
    these are used by the system view "pg_stat_transaction_functions".
    But the functions getting statistics on tables are not working for some reason,
    used by the system view "pg_stat_transaction_tables".
    The columns "idx_scan" and "idx_tup_fetch" gives the same result on 8.4.3 and 9.0beta1,
    but the columns "n_tup_ins" and "n_tup_upd" return 0 on 9.0beta1 even though inserts/updates occurred
    during the current transaction.
    Have the statistic data structures changed from 8.4.3 to 9.0beta1?

1.2: Bugfix: get_funcstat_entry did not return NULL upon hash miss

1.1: Using hash_search instead of hash_seq_search in get_funcstat_entry

1.0: First version
