Conversion of p/br tags in XML import, fixes #2669

Squashed commit of the following:

commit b42a619ee372c9836d273cc337477424b2d6ae6a
Author: José Raddaoui Marín <raddaouimarin@gmail.com>
Date:   Wed Mar 27 00:09:07 2013 +0100

    Cosmetic changes

commit d90761975426fd1a76a1d415fc3a88b4a6554634
Merge: ff8eb3a 0e6cb3a
Author: José Raddaoui Marín <raddaouimarin@gmail.com>
Date:   Tue Mar 26 00:48:30 2013 +0100

    Fix conflicts

commit ff8eb3a60ca138614b56d06a5f913c27300f8753
Author: José Raddaoui Marín <raddaouimarin@gmail.com>
Date:   Mon Mar 25 19:26:11 2013 +0100

    Add QubitHelper.php to the branch, forgotten in last commit

commit e256abc63e3834f9b5d834347bb46a7ec7cebdec
Author: José Raddaoui Marín <raddaouimarin@gmail.com>
Date:   Mon Mar 25 16:54:14 2013 +0100

    Add a function in QubitHelper to replace '\n' for '<lb/>

commit afad854036c5924682ea4f6761da67469fe63218
Author: José Raddaoui Marín <raddaouimarin@gmail.com>
Date:   Sun Mar 24 00:57:20 2013 +0100

    Replace '\n' for '<lb/>' in EAD export, fixes #2669

commit e3b841d1295b5db58cf0beaf8cf47070ffd5e1de
Author: José Raddaoui Marín <raddaouimarin@gmail.com>
Date:   Sun Mar 24 00:21:13 2013 +0100

    Replace <lb> tags for '\n' in EAD import
Import script of material/description, fixes #4508

Squashed commit of the following:

commit e3fa66dc9263d1731027a23710e23ed45e04c91c
Author: José Raddaoui Marín <raddaouimarin@gmail.com>
Date:   Wed Mar 27 00:01:57 2013 +0100

    Add all scripts in EAD xml import

commit 1fe8ec03e3d032ae1f5241d4f48099a358da9456
Author: José Raddaoui Marín <raddaouimarin@gmail.com>
Date:   Tue Mar 26 23:58:39 2013 +0100

    Add scripts of description in EAD xml export

commit ef8bdabd5b035ff09c273ec6434f476f870d26f7
Author: José Raddaoui Marín <raddaouimarin@gmail.com>
Date:   Tue Mar 26 23:57:10 2013 +0100

    Add scripts in EAD xml export
Fix #4165 by accessing to sfRadPlugin properties

Squashed commit of the following:

commit 4f2d2cd112c5c8dc2dddc038dab9d5d6d29a5c4f
Author: José Raddaoui Marín <raddaouimarin@gmail.com>
Date:   Wed Mar 27 04:47:52 2013 +0100

    Change how some fields are taken for validation