test: add TLog function to set log output to a *testing.T

Change-Id: I68d945634ce7780acabf120fe27989083fb02a04
search: fix a panic in Query w/ describe, add tests

Change-Id: I4a2288298fbab8a51c795b9eaed5fc3488024132
test: let TLog take a testing.B too. add tests.

Change-Id: I25c47960ef63be85994a133da85072005ca47a85
leveldb TODO

Change-Id: I20f5b0491d3adcc7eca89d819345efd31f11adde
index: let benchmarks disable some expensive memstats

Change-Id: I0138148ffa2543985bb78fb69ac2b122b50d0a04
index: remove 2 allocs (3% of mem) in kvClaim, via Corpus.mergeClaimRow

And some tests.

Change-Id: Ifd57b027e193d0356bca140c93c18963be664bae
Fix API typo: ParseTime3339OrNil, not OrZil

Change-Id: I1255cf4560d133fe5c6128fba0be2d9d4a0c0daa
index: add BenchmarkCorpusFromStorage

Change-Id: Ifba96f21d5a003150062d988129c2c24fcae878c
little TODO

Change-Id: Icda704f63db4ad39ea4bfe13bb9b7d62b227d662