fixed to avoid using 'show status' and use 'show global status' in all operations
Fix to add Qcache_hits value to Com_select in order to get the real value
added new value Query_Cache_Hit_Rate
added new value Query_Cache_Hit_Rate
inversed 'use lib' lines
changed the 'mysql' graph 'Table Saturation ...' to be represented per minutes
added the new value 'Prepare Stmt Execute' in MySQL graph
updated
added the value 'Temp_tables_to_disk' in the MySQL graph
added systemd service file template
reversed 'use lib' lines
updated