Merging in OSX customizations:

Merging in OSX customizations:

A ext/sqlrr/sqlrr.[ch]
-- add sql recording/replay support (very experimental extension -- pre alpha)

M ext/rtree/rtree.c
-- fix cast compiler warning

M src/func.c
-- substring backward compatiblity <rdar://problem/6778339>

M src/legacy.c
-- replay recorder calls

M src/main.c
-- if SQLITE_ENABLE_AUTO_PROFILE, call sqlite3_profile when env(SQLITE_AUTO_PROFILE)
-- replay recorder calls

M src/mem1.c
-- use custom malloc zone on single core systems

M src/os_unix.c
-- hostid via gethostuuid
-- read-only file system support for proxy locking
-- improved handling of simulated shared lock on AFP/SMB on 64 bit systems
-- disable whole-file-lock NFS file locking
-- fix for downgrading from exclusive to shared lock on NFS
-- proxy lock breaking & recreating local lock files
-- support SQLITE_OPEN_AUTOPROXY flag
-- only write 1st byte into new zero-length files if fs is DOS
-- cache fs type info in unixFile struct
-- force use of fsync() even if fdatasync() is available
-- remove flock locking style support for SMB
-- replace strcpy with strlcpy

M src/prepare.c
-- replay recorder calls

M src/sqlite.h.in
-- added SQLITE_OPEN_AUTOPROXY

M src/sqliteInt.h
-- include replay recorder header

M src/vdbeapi.c
-- checking for NULL statement for <rdar://6646331>
-- replay recorder calls

FossilOrigin-Name: 941a01eb868815f566539e9ab21f807d9e798e40