Commented the file chooser in the file driver.

The directory chooser seems to cause an issue, because removing
it doesn't cause this :
=================================================================
 A fatal error has been detected by the Java Runtime Environment:

  SIGSEGV (0xb) at pc=0xb777dcb7, pid=15038, tid=1783286592

 JRE version: 7.0_21-b11
 Java VM: Java HotSpot(TM) Server VM (23.21-b01 mixed mode linux-x86 )
 Problematic frame:
 C  [libpthread.so.0+0x8cb7]  __pthread_mutex_lock+0x17

 Failed to write core dump. Core dumps have been disabled. To enable
 core dumping, try "ulimit -c unlimited" before starting Java again

 An error report file with more information is saved as:
 /home/denis/Ensimag/ProjetSpe/Dahu/editor/hs_err_pid15038.log

 If you would like to submit a bug report, please visit:
   http://bugreport.sun.com/bugreport/crash.jsp
 The crash happened outside the Java Virtual Machine in native code.
 See problematic frame for where to report the bug.
=================================================================