Point in time recovery 20020822_01_pitr.patch

Here's a patch to do point-in-time recovery against 7.3 head. Still to
be resolved in this patch:

    * CREATE/DROP database are still unlogged. dbcommands.c needs a
re-write to make that possible, since all the file and directory
operations will need to be logged, as will the data.

    * Is it really safe to do block-aligned reads to copy the database
files once (if) we remove backup blocks from the log? Should support be
added to go through the buffer manager?


New Files:
    ./doc/FAQ_PITR
    ./src/backend/commands/recoverycmds.c
    ./src/include/commands/recoverycmds.h


--
J. R. Nield
jrnield@usol.com