Plot CPL tables/images

Plot CPL tables and/or images using an external plotter specified by the user. This is useful for debugging, and might also be useful for the user. This module provides only basic functionality for plotting CPL objects; for more advanced purposes, a dedicated FITS viewing tool is recommended.

This module depends on the availability of the system call setenv. This is *not* defined in ANSI-C (getenv() is; setenv() is not) and therefore might fail for various reasons on different platforms. Note that the plotting/imaging functionality can be easily switched off by setting the plotting/imaging commands to 'no'.

If a plotting call fails for 'external' reasons (i.e. when communication with the external process), a warning message is printed, but success status is returned. A failure exit status is returned only in cases of invalid input (null pointers etc.).


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