Reinstall the possibility to manage mail parameters

When clicking on the "mail" button in the main grib dialog, the write/send dialog is open allowing to set the different request parameters.
-Changing the model will enable/disable the different parameters according to this model.
At the bottom the mail is displayed as it will be sent. Each time a parameters is changed the mail is re-written.
There are three buttons 
"cancel" to exit without action off course
"save" to save the setting and exit
"send" to send the mail . we stay in the dialog . the mail is replaced by a message (in red) and the button "send" disappear .
If a parameters is changed , the button  comes back allowing to send a new mail
There are two messages : one if succeed and one if not .
All the error messages coming from the mail functions if there are failures are directed to the log file.

attached two shots
Jean Pierre

![grib1](https://f.cloud.github.com/assets/2202442/462796/8409ab30-b4df-11e2-94d0-5f5a171ada3b.jpg)
![grib2](https://f.cloud.github.com/assets/2202442/462797/8c201804-b4df-11e2-858c-6d278448a95a.jpg)