- update to 5.30.3:
  - Crash bugs fixed - the program crashed when renaming teachers/students
    and removing their attached constraints not available times
  - Brazilian Portuguese translation update, by Alexandre R. Soares.
  - Code cleanup.
  - Corrected two minor typos in the source code (reported by Alexandre R. Soares).
  - Updated the sources to gcc-6.1.1 (but the Windows version still uses MinGW 4.9.2).
  - The code in the HTML timetables tries to avoid page breaks in the tables
  - Rare crash bug fix in the activity planning form
  - Updated to Qt 5.7.0 
  - Bug fix: the 'Activities rooms statistics' did not work correctly:
    it considered even inactive constraints (reported by math user).
  - Added the possibility of selecting whether to print the detailed or
    the less detailed HTML timetables for the groups and years (suggested
    by math user, implemented by Volker Dirr and Liviu Lalescu).
  - Added the target number of hours for teachers
  - Added the teachers' qualification to teach certain subjects, and 
    the statistics to show where the qualification of a teacher for a
    subject is not respected
  - Added 12 new example files from Namibia, by Bobby Wise.
  - Interface improvement: the shortcut buttons on the main form
    are better arranged (suggested by math user).
  - Added more checks before the generation start
  - Very rare bug fixed (probably never met in practice).
  - Generating the activity tags timetables
  - Added comments for teachers, students, subjects, activity tags,
    rooms and buildings
  - Very rare crash bugs fixed (reported by mouiata).
  - Added a new example file from Indonesia, by wahyuamin.
  - ...

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