Links:
* http://heasarc.gsfc.nasa.gov/docs/software/fitsio/fitsio.html
* http://fits.gsfc.nasa.gov/fits_libraries.html
* http://fits.gsfc.nasa.gov/fits_samples.html
* http://www.cv.nrao.edu/fits/data/samples/
* https://www.spacetelescope.org/projects/fits_liberator/datasets_archives/
Some of these are/will be implemented in the FITS header edit widget
* http://fits.gsfc.nasa.gov/ErrorList.html
These keywords except the mandatory ones are autocompleted in the FITS keyword adding dialog
* http://heasarc.gsfc.nasa.gov/docs/fcg/standard_dict.html
Features that should be tested more:
* Import FITS images to spreadsheets and matrices
* Import FITS tables to spreadsheets
* Export matrices to FITS images
* Export spreadsheets to FITS tables
FITS header edit widget:
* Adding new keywords
* Removing keywords
TODOs:
* Enable deletion of FITS extensions from the FITS header edit widget
* Keyword modifications to be saved to the FITS files
* Import FITS tables to matrices
* When importing tables to spreadsheets, set the columnmodes separately for string/numeric columns
* Export matrices to FITS tables
* Export spreadsheets to FITS images
* Maybe copy-paste extensions
* Add new options to the export dialog when exporting to FITS:
* Select FITS extension type
* When exporting containers to FITS decide whether the extension's name should be the container's name
* When exporting spreadsheets to FITS decide whether the column comments should be used as the column's units.