Added syncutil.Once

Change-Id: I83744a3646bac449934ab0dc6477b4dd1c351e5e
Merge "Added syncutil.Once"
pkg/search: Add durationms to MediaTagConstraint comment.

Change-Id: I8c097c2c88afaf01b9eb0f62072f5e68bddf5ca0
Merge "pkg/search: Add durationms to MediaTagConstraint comment."
osutil: add MemUsage func

Change-Id: I4a0cbde782077c5b34caefd9b6bdb99bc659c2c9
schema: don't use ReceiveBlob directly

Change-Id: I268165cdaa4e4c8fea720a57a58cccc0f934cdf2
client/android: instrument memory usage.

also try to GC and return memory to OS every 5 seconds, but
that barely makes a dent in the real problem.

more later.

Change-Id: I2979e099121bdcb8578124b1c45714313cc2ec09
Merge branch 'master' of https://camlistore.googlesource.com/camlistore