Also change return of get_gps_sec() to int

script takes the difference between system time and gps time, then
calculates an offset based on the difference,
rounded to the nearest whole day, on the theory that the cards are only offset
by entire years plus some number of leap days.

Also fixes a bug where the auto flag was always true.

Also change first_adc_read variable name to adc_read_state

1PPS check and ADC sync should happen with no time_shift.

 * Updates to the test to make sure the daqd starts at a good time.

 * Presently the test introduces duplication between the regular channel and a test point.

 * Use unordered_set as we don't need a map, only to check existence.
 * Use find instead of [] to provide better signaling of what we are doing.
 * Use explicit insert.

 ** Note the find/insert could be combined for a more efficient operation, but it is a little less readable and this code is only executed once.

Old code use of char* failed as std was likely using pointer address instead of actual string

Change LIGO_DUR_t to LIGO_TIMER_t, var should be used to store raw time captures, durations are stored in int/int64 (ns, us, etc)

Fixing bug where check does not work with RFM1 IPCs, and adding check to kill build if we use an index higher than 63 for RFM IPCs