ADC finally works with timer!!

Problem was size of delay for 16b timer. value loaded was > 16b.
Fix by either using 32b timer and long, or make sure loaded value
smaller than 16b (65,535).

Also did some code revision to limit samples to defined value. sample
overrun was caused by lag time of ADCSequenceDataGet().

Next steps: verify collected data integrity & perform compute.
don't know if ekg is reading from A0 in (pinE7)