[up] Main graphical user interface + version

This version is called SnPM13

SnPM is now an SPM toolbox that is automatically recognised by SPM and
loaded at startup.

SnPM can now be called in two ways:
- Using the Batch window from the SPM -> Tools -> SnPM menu
- Using SPM Main window under the Toolbox menu there is an SnPM submenu.
[up] Simplify tag in SnPM job structure

snpm_bch_cp becomes cp and snpm_bch_pp becomes pp (snpm is already
mentionned in the structure as a subelement of spm.tools)
[up] Update one-sample test according to new job structure