* distinguish select (among futures) from select coins. Regex search in project for select\b shows we hardly use select, but maybe could use it to add timeouts more cleanly. ("Want to add a timeout to any future? Just do a select of that future and a timeout future!" from https://aturon.github.io/blog/2016/08/11/futures/)
* remove a trailing space
* FAQ.md - fix typo
* wallet: display problematic tx
* update FAQ build troubleshooting to cover #443
* stdout_log_level = Info
file_log_level = Debug
* sync: show total diff @ height when syncronization is completed
* better wallet send dest format error
* move INFO "Client conn ... lost" and "Connected to peer" down to Debug
* move some level=Info to Debug, add 1000-block outputs
* FAQ: fix capitalization
* FAQ: friendlier answers. Move Q: crash/hangs under the Troubleshooting section
* FAQ: add missing A for block size/target mean time
* FAQ: Add link to grintest.net (see also #325)
* FAQ corrections
- link to Scripting discussion
- Quantum unsafe, says A.P.
