Log Message:
mate-calc: update to 1.22

### mate-calc 1.22.0

  * Translations update
  * Initialize Travis CI support
  * math-window: update copyright year to 2019
  * Increase accuracy range to 15
  * math-display: avoid deprecated 'gtk_widget_modify_bg'
  * currency-manager: avoid deprecated 'g_type_class_add_private'
  * currency: avoid deprecated 'g_type_class_add_private'
  * math-equation: avoid deprecated 'g_type_class_add_private'
  * unit-manager: avoid deprecated 'g_type_class_add_private'
  * unit-category: avoid deprecated 'g_type_class_add_private'
  * unit: avoid deprecated 'g_type_class_add_private'
  * mp-serializer: avoid deprecated 'g_type_class_add_private'
  * math-variable-popup: avoid deprecated 'g_type_class_add_private'
  * math-preferences: avoid deprecated 'g_type_class_add_private'
  * math-variables: avoid deprecated 'g_type_class_add_private'
  * math-converter: avoid deprecated 'g_type_class_add_private'
  * math-buttons: avoid deprecated 'g_type_class_add_private'
  * math-window: avoid deprecated 'g_type_class_add_private'
  * Remove dublicated assignment
  * disable deprecation warnings for distcheck
  * math-display: avoid deprecated 'g_type_class_add_private'
  * math-window: Fix memory leak
  * math-display.c: avoid deprecated 'gtk_widget_ensure_style' (#66)
  * data: update appdata directory
  * ui files: add missing icons in titles to dialogs
  * buttons-programming.ui: Fix buttons
  * Use make functions for HELP_LINGUAS
  * Write equation using MathML
  * Fix application name
  * Fix repeated words
  * tx: add help for user-guide to transifex config
  * Copy equation as ASCII text