Overview of changes in gnome-calculator 49.alpha
    * Allow input and output of sexagesimal (DMS) values #12 !292 !320 (fcusr)
    * Improved error handling for trigonometric functions #61 #375 (fcusr)
    * Added support for permutation and combination #87 (fcusr)
    * Added support for arbitrary root function #88 (Robert Roth)
    * Added support for greatest common divisor and least common multiplier #89 (fcusr)
    * Improved log function handling #92 (Robert Roth)
    * Added a button to indicate angle units used #447 #218 #125 !253 (fcusr)
    * Added support for selection parts of previous calculations #295 (Robert Roth)
    * Added backspace button #331 #345 !247 (Adrien Plazas)
    * Added constants to the variable popover #334 !288 (fcusr)
    * Added support for repeating last operation #342 (Robert Roth)
    * Added wrapping of long history entries #439 (Robert Roth)
    * Added Egyptian Pound currency #443 (Robert Roth)
    * Fixed right shift with negative numbers #474 (fcusr)
    * Fixed Polish Złoty currency name #478 (Robert Roth)
    * Fixed incorrect pressure unit conversions #480 (Robert Roth)
    * Improved operator buttons #484 (fcusr)
    * Reworked button grouping for each mode (Adrien Plazas)
    * Improved adaptive windows for smaller/larger screens !252 !285 !372 (fcusr)
    * Improved help and shortcuts (fcusr, Robert Roth, Adrien Plazas)
    * Improved accessibility (fcusr)
    * Added support for NAND, NOR and XNOR operators !271 (Adrien Plazas)
    * Improved function handling with buttons and selections !267 !342 !340 (Adrien Plazas, fcusr)
    * Added preference to disable currencies in auto-complete #428 !272 (fcusr)
    * Added preference to show currency codes in converter #150 !274 (fcusr)
    * Added support for marking currencies as favorites #228 !277 (fcusr)
    * Various variable and function popover improvements !286 !287 !321 !323 !326 !353 (fcusr)
    * Added British Pint and Gallon units !311 (fcusr)
    * Fixed handling of very small numbers and improved error handling #464 !316 (fcusr)
    * Added some statistical functions !362 (fcusr)