Little fix for the reordering of the lines

When a line is cloned, the weight of the new line wasn't set.
And there was a little copy/paste error in the legend
Evolution in the user edition

We now have to validate the changes with our password.
Also, if we want to change our password, a double-check system has been set
to avoid the mistakes.
Add an effective period to the checks (sql script)

4 columns was added in the checks table to define
start/end time and start/end day for a check so that the application
won't notify the users if an alert happens outside of this period.
It can be usefull to not monitor data during the night and the week end
or other applications...
Send a mail to all the users of a check

It can be usefull to start a debate, discuss values or tell the others
after an alert that you worry it.
Add other usefull values to the dashboard options

Options like "yesterday" start from midnight
Add a CSS class to the btn
Modifiy test to activate "result.php" menu
Add an ignored option given to graphite
Compute an explanation of the period on the fly

In the edit page of a check (threshold or predictive) a function javascript
displays a sentence explaning the effective period of when the check will
be applied.
Add link to switch between edit and view for check
Patch for the mail sent by the check view

The subject is prefilled by the name of the check
The user who send the mail is added in the recipient list even if he isn't in
the list of the users who subscribe to this check.
Zoom on a graph by selecting a period on it

On the dashboard view, the user can select a period on a graph,
the graph will be refreshed and this zoom will be applied to all the
other graphs.
A little jquery modification
CSS class modification
Comment of the alogrithm +fix include of moment.js
Add a loader while importing a dashboard
Javascript refresh instead of meta one

The meta refresh has been replaced by a javascript one so that
it can be disabled. A graph zoom is lost when the page is refreshed,
so the need is to stop the refresh rate during the analysis of the graphs
when they are zoomed.
A button to edit the graph has been added and also a button to view in large
the graph with it current zoom.
The left-margin of a graph isn't the same if the graph has or not
a title for the y-axis, so this margin has been parameterized.
Correction of the regex

The regex only matched the last digit and not all of them.
e.g. for "-24hours" it only matched "4" and not "24".

A "<br/>" was also added in the title
Make selectable the target of a draggable cell
Truncate the names of graph that are too long