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

Conflicts:
	Makefile.in

Main change is the type of json value which I changed in master and did
not follow in ITP. Now record are not sent as List. They are maps as in
master. This is quite a big change as json_util completely changes.

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.

temporarily the Why3 command is called 'newreplay'

adding the replay command in command line

- removed a temporary harcoded setting of steps limits
- allow reply to replay only obsolete proofs