search: TimeConstraint

Change-Id: Ic50290109043c1ad906f25935e5fad4c2170ea77
search: skip TestHandler in short mode

Change-Id: I6f0c651cf7bf4324c9c4d785400588c2ff08557e
search: start of DirConstraint. mostly notes. not implementation.

Change-Id: I6403b4f9be2aa06778fb1ef96edde2896557c3c9
index: doc tweak

Change-Id: I30836b1a6967ac86f7f16118a9bf81a293b09a27
TODO: use glog

Change-Id: I94ce97b93c73bee47f90a966f5cb1e860b23233a