Global changes

• Control of the verbosity of informational messages is now possible through the environment variable MSG_FILTER. ILEVEL and QUIET parameters that previously controlled messaging are no longer used. See Verbosity of Messages for details.

• Added support and documentation for the new FRACTION Frame supplied with every NDF. Documented how NDF sections can now be defined by percentages along each dimension.

• The default for the CATFRAME parameter (used by various applications to indicate the Frame  in which axis values should be stored within an output catalogue) has changed. It is now the current Frame in the WCS FrameSet associated with the input data.

• Additional colour tables from GAIA have been added.

• Application parameters that take groups of values are now stored in expanded form in the HISTORY component of any output NDFs.