Log Message:
mate-calc: update to 1.26.0

Change log:

### mate-calc 1.26.0

  * Translations update
  * Add build support for meson
  * integrate unittest into test-mp-equation
  * Fix declaration/definition mismatches
  * update copyright to 2021

### mate-calc 1.25.1

  * Translations update
  * build: abort configuration when development library for MPC is missing
  * history view follows preferences
  * mp-serializer: init MPNumbers outside of loop
  * mp.c: mp_reciprocal: fix when calling it with same arguments.
  * mp-serializer: fix memory leaks reported by valgrind
  * math-buttons: fix memory leaks reported by valgrind
  * factorization: display prime factors in fixed number format
  * build: add configure summary
  * build: Use PACKAGE_URL variable
  * build: Use config.h which defines GETTEXT_PACKAGE & VERSION
  * Update copyright to 2021
  * insert character dialog: add spacing, remove invisible char
  * remove unused trunc button from programming mode
  * Remove warning about unused parameters in `��nt main` function
  * financial: Remove warnings about unused parameter 'equation'
  * math-buttons: Remove warnings about format not a string literal
  * Remove unused macros
  * Show factorization in history view.
  * Show exponents in factorization.
  * Update Readme
  * Remove USE_MATE2_MACROS from autogen.sh (legacy)
  * Fix most conversion warnings.
  * Improve factorization speed
  * fix calulation of x^q, where 1/q is a negative integer
  * Clear answer if editing right before it
  * Refresh bits panel after calculation
  * Correct Astronomical unit (to 149597870700 m)
  * mp-convert: Remove trailing spaces/tabs
  * Implement navigation through history stack equations using keyboard
  * fixes incorrect parenthesis handling

### mate-calc 1.25.0

  * Translations update
  * math-history-entry: Reduce the macro scope and its argument number
  * math-display: Remove unused macro
  * math-equation: Fix memory leak
  * Fix empty string return for canceling complex expressions
  * build: silent build warnings for distcheck
  * Remove -Wshadow warnings
  * Use only one mp_clear statement per line
  * use default MATE_COMPILE_WARNINGS level
  * build: Remove redundant LDFLAGS
  * Add modular exponentiation ability and add acccording tests
  * test-mp-equation: Fix memory leak
  * parserfunc: fix memory leak
  * history-view: simplify code and add clear option
  * math-buttons: add space character after inverse trig. functions
  * math-window: show GNU MPFR and GNU MPC version in about dialog
  * math-display.c: set bottom margin to 12 for gtk widget info_view
  * clear MPNumbers before return
  * add Riemann zeta function and Gauss error function
  * parserfunc: fix crash when calculating nested pow
  * Remove warnings: function declaration isn���t a prototype
  * update complex number help-page
  * unittest.c: replace tabs with spaces
  * configure: check for mpfr version >= 4.0.2
  * Port to GNU MPFR/MPC Library
  * mate-calc.desktop: Do not collect the translation for Icon
  * free variables
  * add history view to show recent calculations.
  * add option to enable/disable history (disabled by default).
  * add possibility to resize mate-calc if history is enabled.
  * Read authors (updated) from mate-calc.about