RPW SBM1

This is a triggered mode involving the dump of a rolling buffer to the SSMM on detection of an interplanetary shock. The detailed data rates calculated here don't completely match those in the Plasson presentation used to calculate the summary rtaes, although the discrepancy isn't as big as for SBM2. This is likely based on assumptions about trigger duration used in the volume estimates in the plasson presentation. For both SBM1 and SBM2 the summary rates are higher so will be used wherever possible.