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Previously, the combination of reflection_new and add_refl_to_list gave
a way to side-step the usual check that the indices were not larger
than 512.  This causes corruption of the RefList, so much be avoided.

Closes: #52

Closes: #28

When using the GUI, it will be set to the corresponding indexing result
name.

Also fixes newline at end of files

It's only used once, to get background colours for 'indexamajig
--int-diag', itself a rarely used feature.  The dependency itself seems
to cause problems for some people, particularly those not using system
libraries for everything.  So I think it's better just to remove it, and
use ANSI escape codes directly.

Closes: #19

This avoids that all of the private structures get included in the API
documentation.

This also removes Doxygen from the CMake build system.  It doesn't seem
worth trying to make it work both ways.

Fixes: #48

Closes: #49