Restructured (cleaned-up) version of ciefunction (July 2017) uploaded in new branch 'aangstroms_escapade'.

Revision 10 July 2017.
Heavily revised version of 'CIE Functions' (Uploaded in new branch 'aangstroms_escapade'):

General restructuring/clean-up to make the program code easier to read.
The calculations are in principle the same as in previous versions, but the code is made more modular, among others by introducing a number of new functions corresponding to the different colorimetric representations provided (listed in the drop-down menu).
Many variable names are replaced by names/symbols that resemble standard colorimetric nomenclature (in particular, some greek letters (Unicode) occur).
To some extent, explanatory comments are added.
New feature providing plots and tables of the CIE 2006 cone fundamentals as given in logarithmic units are included.
A bug relating to the reading of numbers from the 'field_size' spinbox is fixed.
Some minor other fixes are made.

ifarup / ciefunctions