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no empty dir will be created with a name having an extension, eg

  why3 ide file.mlw

will now signal an error if file.mlw does not exist

side effect: Open_Session request is disabled, will see if we want it later

Premises, goals and neg_premises of the task can now be shown directly on
the source code.
Notification Task was extended with a list of couple location, color.

Removed unnecessary duplications of cont_from*

on cross button.

print the backtrace and exit. Formerly, the exception was caught by GTK.

which holds the changed state of the source file.
To be improved.

- handling missing queries and notifications
- turn strategie messages into true debug messages
- trying to grab the focus in the entry zone as much as possible
- write_file put in sysutil