Use dmqmc_estimates_global handle in fciqmc_header.
Use dmqmc_estimates_global handle in fciqmc_header.

We were still using the global excit_dist object, which resulted in an
incorrect number of header items being printed out.  Be consistent with
the actual output of the data table instead.

hande-qmc/hande,hande-qmc/hande,hande-qmc/hande,hande-qmc/hande,hande-qmc/hande,ruthfranklin/hande