Fix: Exception when decreasing indent.

Fix to prevent an exception when decreasing indents if the length
of the last line of file is less than the indent width.
Added test for "Decrease Indent with 1 char on the last line"
See #1271
introducing jSSC: an RXTX replacement
linux: adding support to ttyACM devices
removing old rxtx references
jssc.jar update for mac
min jre version on windows
null check on SerialPort.readBytes