Add a counter that increments every time the device is restarted.

Would be useful to track unmonitored device restarts.

Display of Map-path in Gui-list
I use paths for the maps as short as possible, so even the first characters of the filename is displayed in Gui.
By trials with navit-apk_0.5.4 I found, that these paths are no more accessible for navit. I succeeded finally with path like
"/storage/0403-0201/Android/data/org.navitproject.navit/files/SW_Paris_Grosseto.bin".
The use of this path is no problem.

I am trying to support Raspberry Pi 3. The linux driver code has the 7100 but not the 7000 listed.
When I try to compile on raspberry - jesse it gives error:
make[1]: *** /lib/modules/4.9.59-v7+/build: No such file or directory. Stop.

The Simcom site says there are both linux and android drivers for the 7000, but I can not find them.

The module works perfectly with Arduino! Thanks.
Bob