AST Version 9.2.12

• A new attribute called IgnoreBadAlt has been added to the FitsChan
  class. If set, it allows unreadable alternate axis descriptions within FITS-WCS
  headers to be ignored. By default, such headers would cause an error to
  be reported.
• A new warning called BadAlt has been added to the FitsChan class. If
  included in the list of active warnings (see attribute "Warnings"), a
  warning will be created if any alternate axes are ignored when reading a
  FITS-WCS header.
• The FitsChan class now supports 64 bit integer keyword values.
• The Table class now supports 64 bit integer columns.
• The FitsTable class now supports 64 bit integer columns.