The debug version are to run with gdb, the GNU debuger, in case the program crash.
Replace the standrad binaries with the content of the archive.
To install gdb on Linux look for this word in your package manager.
For Windows get the above gdb_72_i386 for 32bit version, or gdb_72_x64 for 64bit,
and copy it to the same folder as skychart.exe
To run in debug with Windows:
Open a command line console
cd ...ciel...path... (\Program files\Ciel)
... after the crash
Zip and copy the information to the bug tracker at http://www.ap-i.net/mantis
The most important part is the result of the bt command (backtrace) you do just after the crash.