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xsect: set the photoionization cross-sections

Change the photoelectric absorption cross-sections in use.


Syntax:           xsect [bcmc|obcm|vern]


The three options are: bcmc, from Balucinska-Church & McCammon (1992; Ap.J.400, 699) with a new He cross-section based on (1998; Ap.J. 496, 1044); obcm, as bcmc but with the old He cross-section, and, vern, from Verneret. al. (1996 Ap.J.). This changes the cross-sections in use for all absorption models with the exception of wabs.