FET full changelog

Added three new types of space constraints: room(s) pair of mutually exclusive time slots, room(s) pair of mutually exclusive sets of time slots, and room(s) occupy(ies) max sets of time slots from selection (suggested by Rodolfo Ribeiro Gomes). On this occasion, there were added the general constraints (for all rooms, not only for a single room, as in the previous versions) of type rooms max activity tags per day/real day/week.
Minor bug fixes and improvements.

Corrected a few compilation warnings when using an older C++ compiler.
Updated the Italian translation, by Andrea Primiani.
Minor improvements.

The command-line version now allows completely configuring the data to be printed in the HTML timetables, as in the GUI version (suggested by hold_find).
When choosing the data to print in the timetables, it was added a simple option to copy (propagate) all the settings from the current tab to all the tabs from 4 to 21 (suggested by GUEFFAZ REDA).
Updated the Arabic translation, by Benahmed Abdelkrim.
Minor improvements.

Updated to Qt 6.10.2.
Bug fix: the human-readable text file should not have been shown if the user did not create or load a file (reported by GUEFFAZ REDA).
Improved the colors handling in the human-readable data (by g.theodoroy).
Minor improvements.

Compilation bug fixed: it was impossible to compile FET with the option USE_SYSTEM_LOCALE enabled (reported by g.theodoroy).

Improvements in the interface: the constraints with tables will be shown in human-readable form (suggested by GUEFFAZ REDA, and maybe other users in the past). g.theodoroy had useful suggestions and contributions, and wrote the code to divide the tables in the Mornings-Afternoons mode.
The detailed description of the teachers now include their 'not available times' constraints, in human-readable form (suggested by GUEFFAZ REDA).
Improvements in the interface: all the 'list constraints' dialogs now contain Up/Down buttons.
The user can view/save the file in a human-readable text form (it was DT's suggestion to allow saving the data as an HTML file).
The user can backup or restore the settings to/from an INI file (suggested in the past by Bobby Wise, and maybe by other users).
Minor interface bug fixes.

Improved the CMake build files, by Michael Towers. Volker Dirr (assisted by Gemini and ChatGPT) also had some useful suggestions.
The FET translations now include also the Qt translations (suggested by Michael Towers).
Added more filters in the all time/space constraints dialogs: check boxes for miscellaneous, teachers, students, activities, subjects and tags, and rooms constraints (suggested by GUEFFAZ REDA, who also reported some critical bugs, fixed before the official release). Also, following a suggestion by GUEFFAZ REDA, the user selections for the check boxes are now saved/restored.

The sources and the GNU/Linux binaries are now archived with tar.xz (suggested by Michael Towers).
It is now possible (and recommended) to build FET with CMake (minimum Qt version for CMake: 6.10) (suggested by Michael Towers, who also provided extensive instructions/help on how to do this; also Volker Dirr, assisted by ChatGPT and Gemini, suggested some important corrections). On this occasion, we added an improvement so that the engine is no longer compiled twice, but only once, as a static library (suggested by Volker Dirr, assisted by Gemini). QMake is still supported, but not recommended (one reason is that the engine is compiled twice, and another reason is that it is an old building method). Older Qt versions (5.15 to 6.9) are supported only with QMake. Chichi Lalescu suggested the code to make the conditional building of FET with the language preselected to the local language, enabling the option USE_SYSTEM_LOCALE.
Minor improvements (suggested by Michael Towers, found using Qt Creator).

Improved the command line generation, by removing the additional thread which was checking for the possible existence of the 'sigwrite' file. The new check for the existence of this file is done in the already existing generation thread (idea and code suggested by Michael Chourdakis).
Minor improvement: the History states will now be stored in four std::deque-s instead of four std::list-s (but the improvement is not noticeable in practice).
Minor improvements.

Bug fix in the new feature, introduced in version 7.6.0, to view/edit the related constraints in the timetable view days vertical dialogs (reported by GUEFFAZ REDA).
Improved the layout of the option to view/edit the related constraints from the timetable view dialogs, to save space (suggested by GUEFFAZ REDA).
Corrected the Arabic translation, by Benahmed Abdelkrim (fixing an error reported by GUEFFAZ REDA).