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
* Imported FITS tables to spreadsheets - spreadsheet columnmodes set properly for string/numeric columns
* Export matrices to FITS images
* Export matrices to FITS tables
* Export spreadsheets to FITS tables
* Export spreadsheets to FITS images
* Exported spreadsheet's column comments as FITS table column units, if checked in export dialog and exported to a table
* Set start/end columns/rows in import
FITS header edit widget:
* Adding new keywords
* Removing keywords
* Deleting FITS extensions
* Add keyword units
* Saving keyword modifications
TODOs:
* Import FITS tables to matrices
* Maybe copy-paste extensions