Comments correction

In order to generate with phpdocumentor a good doc,
the params of the functions updatePassword and getByLoginPassword must have the same name in the comments and in the implementation.
Actually, doc will be generate with 3 params instead of 2.
Add comment param to getRandomPassword

add the comment to withoutSpecialChars, with the list of char
Fixes #1513 - jauthdb_admin: admin couldn't change the password

Even if the administrator had the right to change the password of an other user, he
couldn't access to the form. This is because we retrieve the right in the constructor
of the controller, whereas the session is not started yet at this moment.
Merge branch 'jelix-1.2.x' into jelix-1.3.x