Update sync_hd

# Dependencis: rsync, lvm2
  SCRIPT_NAME=sync_hd
# VERSION=8.3
# DATE=07-avr-14
# ERROR: 	THE MAIN SCRIPT IS NOT WORKING THE $CURRENT_USER VARIABLE DOES NOT GET THE RIGHT USER. 
#			A SIMPLE FIX HAS BEEN IMPLEMENTED.
# Description:
#			Actual Description: it syncronizes your main hard drive with a external to create a backup. And
#						it also saves all the changes in to a file called HISTORIAL.
#			Expected Description: IF logged on the main USER then not full sync. if loged on other USER do full sync. 
#      This is a hack. actually i wanted to do syncronize a hard drive, but if it is use it is not possibly to syncronize
#      everything, so i log from a live image to syncronize the Full hard drive.
#
# IMPLEMENTATION:	-If not logged on main hard INTERNAL_DRIVE then full sync
#			-Save the last 3 synchronizations or save by date... 'save the syncs of the last X days'
#			-Add the date of the synchronizations