SMS reception: Behavioral change: We delete messages before handling them to avoid loops around crashing SMSes.
Adding some sample code for the watchdog check.
Merge pull request #4 from jthurner/master

Time: get GMT from HTTP header
Merge branch 'master' of github.com:fclairamb/tc65lib
Time is in seconds. We might change that in the future.

Please not that if you need to fetch the time frequently, you should use the jvm's System.currentTimeMillis().
Fixed the email sending code to actually work.
Added and updated some help messages.

The new help messages are prettier:
[HELP] date                             - Display the current date
[HELP] ntp <server>                     - Get time from a server
[HELP] consider                         - Consider updating code
[HELP] imei                             - print the IMEI of the GSM chip
[HELP] iccid                            - print the ICCID of the SIM card
[HELP] imsi                             - print the IMSI of the SIM card
[HELP] gps [start|stop]                 - GPS start/stop
[HELP] version                          - Show the current version
[HELP] uptime                           - Show the program's uptime
[HELP] uptime 
                       - Show the program's uptime frequently
[HELP] cd <dir>                         - to change current directory
[HELP] ls                               - to list files in current directory
[HELP] cat <file>                       - to display the current file content
[HELP] df                               - to look the currently used space
[HELP] rm <file>                        - to delete a file
[HELP] pwd                              - to display the current directory path
[HELP] wget <url> <file>                - to download a file to a filename
[HELP] sms send <tel> <message>         - Send a message <message> to <tel>
[HELP] console net client <ip>:<port>   - Open a TCP connection and act as new console
[HELP] console net server <port>        - Accept any TCP connection and act a a console on each of them
[HELP] pin lock <code>                  - Lock SIM with a pin code
[HELP] pin unlock <code>                - Unlock SIM using a pin code
[HELP] pin change <old code> <new code> - Change the SIM pin code
[HELP] email                            - Send an email
[HELP] help                             - This help
[HELP] conf list                        - List all configuration settings
[HELP] conf <key>=<value>               - Define a configuration setting
[HELP] conf <key>                       - Get a configuration setting
[HELP] conf save                        - Save the configuration settings
[HELP] restart                          - Restart the device
[HELP] AT***                            - Send AT commads
[HELP] stats                            - Get some system stats
Added some javadoc around the BufferWrapper.
Added the ATExecution.setSsync method.
Simple HTTP time client: We might as well give a python3 sample in the javadoc.
Added the email and the PIN change command to the demo code.
No MQTT at this stage.
Added some documentation around ATExecution.
Email: Added some package doc.
Console: Added some javadoc.
Update README.md

Adding EHS5 & EHS6 in the list of target devices.
Adding "email sending"
Filenavigation: Adding "more" command help.
Adding a watchdog status error provider.

This allows to break/unbreak the watchdog status.
HttpHeaderTimeClient becomes the default way to fetch time.