add temporal index select stage to the cf_restripe

[burlen]

add the teca_temporal_index_select stage, which takes a list of indices that will be presented to the system to be processed.
currently the index_select gets the list indices externally. there';s some ad hoc code in the temporal_reduction app to load the list of indices, the table reader could potentially be used (the list of indices is a table with 1 column), this i/o code could be packaged into the class itself, or a utility that is shared by the two apps.