CPL and postgres problems

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Fix commited and tested.

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Reopen, because cpl-c works, but further tests shows that it segfaults sometimes. Probably a timing issue, as with activated debugging it works flawless. Trace:

#0 0xffffe410 in __kernel_vsyscall ()
#1 0xb7d9b875 in raise () from /lib/tls/i686/cmov/libc.so.6
#2 0xb7d9d201 in abort () from /lib/tls/i686/cmov/libc.so.6
#3 0xb7dd2e5c in __libc_message () from /lib/tls/i686/cmov/libc.so.6
#4 0xb7ddad65 in _int_free () from /lib/tls/i686/cmov/libc.so.6
#5 0xb7dde800 in free () from /lib/tls/i686/cmov/libc.so.6
#6 0xb78d260d in PQclear () from /usr/lib/libpq.so.5
#7 0xb7ce6a6a in free_query (_con=0x819fb00) at dbase.c:303
#8 0xb7ce6dc0 in db_postgres_store_result (_con=0x819fb00, _r=0xbffa8244) at dbase.c:438
#9 0x08115dd8 in db_do_query (_h=0x819fb00, _k=0xbffa8238, _op=0x0, _v=0xbffa8210, _c=0xbffa8248, _n=1, _nc=1, _o=0x0, _r=0xbffa8244, val2str=0xb7ceb4a0 <db_postgres_val2str>,
submit_query=0xb7ce7aad <db_postgres_submit_query>, store_result=0xb7ce6b24 <db_postgres_store_result>) at db/db_query.c:105
#10 0xb7ce69d2 in db_postgres_query (_h=0x819fb00, _k=0xbffa8238, _op=0x0, _v=0xbffa8210, _c=0xbffa8248, _n=1, _nc=1, _o=0x0, _r=0xbffa8244) at dbase.c:346
#11 0xb7a2207b in get_user_script (username=0xbffa82b0, domain=0x0, script=0xbffa8360, key=0xbffa8358) at cpl_db.c:147
#12 0xb7a228a3 in mi_cpl_get (cmd_tree=0x819fc88, param=0x0) at cpl_loader.c:340
#13 0xb7eda1a7 in mi_fifo_server (fifo_stream=0x82c4bc8) at ../../mi/mi.h:84
#14 0xb7edc203 in fifo_process (rank=0) at mi_fifo.c:212
#15 0x080b3338 in start_module_procs () at sr_module.c:571
#16 0x0806f01c in main (argc=5, argv=0xbffa8734) at main.c:824

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I've tried to reproduce this again in the current trunk, with no luck.