delete readme that was a lie
Eventlogger initial commit: add boards & *.conf.h
WIP: rough draft of eventlogger.

Just defines the API, implements the public functions, and provides a
do-nothing private logger thread implementation that drains any posted
events.
Only printf if EVENTLOG_DEBUG is true in eventlogger.c
Set eventlogger thread name
Add simple smoke test of eventlogger
Oops, forgot a semicolon
Enable SDC in eventlogger's halconf.h
Add ffconf.h to eventlogger
Add stripped-down & reorganized sdcdetail.

I took out everything besides polling for the SD card and mounting it
when found.

Hasn't been tested.
Actually build sdc stuff for eventlogger
Add LED SD card insertion indicator to eventlogger
Decrement SDC_CONNECT_MAX_TRIES from 3 to 2.

Connecting seems to always fail every other time, so if we always try it
twice in a row it seems to work 100% of the time. Something's fishy
about that, but whatever works.
Merge branch 'master' into eventlogger
Pull in master just to stay reasonably up-to-date.
RTC seems to work fine
Eventlogger uses mempool-stored Event structs

The struct records the event's posting time in seconds and microseconds,
as well as the event type (an opaque uint8_t).
Buggy port of MPU9150 support from si.

Can get about 900 interrupts, but then device halts for unknown reason.
delete readme that was a lie
Eventlogger initial commit: add boards & *.conf.h