Clean and fix the SD initialization

Remove the script which launch all other scripts. Each script should now be
launch by the user. This commit clean and fix the first of them: SD
initialization.
Clean the initialization of scripts transfer

The transfer of initialization scripts for the Raspberry Pi (with Moebius
system) is done by the '2-setup_scripts.sh' scripts.
Remove general installation script

The global script which call other scripts has been removed. Now, each scripts
is numbered and should be launch in order by the user.
Fix an error with existing 'unzip' directory

If 'unzip' directory exists when trying to unzip the image, an error may
happened when copying image on SD card. Remove 'unzip' directory before any
other action solve that problem.
Remove global installation script for remote

There was a global script which call every other script for installation on the
remote Rapsberry Pi. Remove it and commit all modifications for the installation
scripts for the remote.
Fix a if-test to check if root user

The test should use '==' instead of '='.
Add help to execute this script

The script for the configuration of 'woshilapin' is a little tricky to run. Add
a help message and check if the execution of the script is well before executing
the modifications.