Merge the experimental UNDELETABLE_WHEN_OPEN optimization into the trunk.

FossilOrigin-Name: ee0acef1faffd480fd2136f81fb2b6f6a17b5388

diff --cc manifest
index 11bbba4ce741fe76a8115b285b54a4b6a221734a,e54d79b686dcff4a27b21828a996ab7ec7802f82..5b39f49e1fe8467e2f150295fb3831b8b6f95323
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,8 -1,5 +1,8 @@@
 -C Change\sthings\sso\sthat\sjournal2.test\sworks\swith\sENABLE_ATOMIC_WRITE.
 -D 2010-06-21T12:34:30
 +-----BEGIN PGP SIGNED MESSAGE-----
 +Hash: SHA1
 +
- C Fix\san\suninitialized\svariable\sin\sos_unix.c.
- D 2010-06-19T23:53:11
++C Merge\sthe\sexperimental\sUNDELETABLE_WHEN_OPEN\soptimization\sinto\sthe\strunk.
++D 2010-06-21T12:47:41
  F Makefile.arm-wince-mingw32ce-gcc fcd5e9cd67fe88836360bb4f9ef4cb7f8e2fb5a0
  F Makefile.in a5cad1f8f3e021356bfcc6c77dc16f6f1952bbc3
  F Makefile.linux-gcc d53183f4aa6a9192d249731c90dbdffbd2c68654
@@@ -826,14 -825,7 +828,14 @@@ F tool/speedtest2.tcl ee2149167303ba8e9
  F tool/speedtest8.c 2902c46588c40b55661e471d7a86e4dd71a18224
  F tool/speedtest8inst1.c 293327bc76823f473684d589a8160bde1f52c14e
  F tool/vdbe-compress.tcl d70ea6d8a19e3571d7ab8c9b75cba86d1173ff0f
- P 2241788bc85fbc48e9cfecb95fe0a858338e37cb
- R 519d2c82f8071bfeedb3eae3a50de5e0
 -P 4104b175a8c3560a7680f3d2b54416821bb2e19d
++P 822a0283c6bc1c75001f3d1c528a4ff89c6b039c a64d96db09ef2b7651fa4e98d3c7bf3ae5d3fe96
+ R aa81338105a8066f92038016780c9df7
 -U dan
 -Z 4c6c5e973462d689a9ddf24faae3aa9f
 +U drh
- Z fb28c7b4632831ff9010ebcbf771882d
++Z e0549d09ee79c82d436d5aa9bbd618a3
 +-----BEGIN PGP SIGNATURE-----
 +Version: GnuPG v1.4.6 (GNU/Linux)
 +
- iD8DBQFMHVhqoxKgR168RlERAl0KAJ0Yf2pBemdWub4Zh3gc9Vg3H0bRrgCfb73m
- 7DvKYVz1pMDVAwrfS/3PYDY=
- =DvU8
++iD8DBQFMH19xoxKgR168RlERAt6AAJ96RqboVXAAENNG3NTV/9NSo4zbEgCghTxO
++GuKlnNnL+XTagpq68iLKUhk=
++=R4ik
 +-----END PGP SIGNATURE-----

diff --cc manifest.uuid
index 3af1e5905f4329c5c8a85b0b267e11b6c3ce9211,003bedc5728541d722271b37ed5925def2e6c5f8..e41f233b03f50158c51e27cc0ebe579f1d1cdea1
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- 822a0283c6bc1c75001f3d1c528a4ff89c6b039c
 -a64d96db09ef2b7651fa4e98d3c7bf3ae5d3fe96
++ee0acef1faffd480fd2136f81fb2b6f6a17b5388