make install work also for rpi boxes

- in addition to to_system, we have now to_<box> with every
  type of box
- install is not needed to run under sudo anymore

README.md

@@ -1,13 +1,19 @@
 # Installation tools for APUs and Raspberry Pi boxes
 
-The APU is a Linux box to be used as a control box at LIN sample environment
+Supports teh following boxes used at LIN sample environment:
+
+- bare-apu: Linux box
+- controlbox: from FRM2
+- ionopimax: PLC from Sfera Labs with compute module 3
+- ionopi: PLC from Sfrea labs with Raspberry Pi 3
+- dual-eth-rpi: dual ethernet Raspberry Pi with compute module 4
 
 `cfg/`  contains the configuration files for all boxes
 
 `to_system/`  contains the files to be installed in the system
 
-We have also the Raspberry based PLC Iono Pi Max
-and other Raspberry Pi based boxes.
+`to_<box>/`  system files specific for a box (box names as in above list)
+
 
 ## config files
 
@@ -16,9 +22,12 @@ filename: cfg/(hostname)_(hexdigits).cfg
   * (hostname) the hostname to be given on startup
   * (hexdigits) the last six digits of the ethernet adress of the first interface on the APU (leftmost plug)
 
-content of the config files:
+### example content of a config files for a control box:
 
 ```
+[BOX]
+type=controlbox
+
 [NETWORK]
 eth0=192.168.127.254    # leftmost socket: connect here a moxa with factory settings
 eth1=192.168.2.2        # connected device will get this ip via DHCP
@@ -38,6 +47,19 @@ port=5000   # the port for the frappy server
 startup_text=startup...|HOST|ADDR   # startup text, 3 lines separated with |
 ```
 
+the [BOX] section is optional for controlbox and bare-apu
+
+
+### example content of a config files for a control box:
+
+```
+[BOX]
+type=ionopi
+
+[NETWORK]
+eth0=wan
+```
+
 ## network configuration
 
 The example above fits the most cases.