FIxed disabling not existing draw with keyboard

https://newterm.pl/redmine/issues/78 - disabling not defined draw
with Alt+<num> in draw3 caused closing program with error code
boruta_modbus - removed unused unit_id logic

Removed unit_id logic inherited from mbdmn. In borutadmn each
unit is handled by separate client/server object.
boruta_modbus - new data type: decimal2

Support for values stored as integral and fractional part
in two following registers. Alpha version.
Merge current stable version: 3.14.10
building unstable
Merge previous unstable version: 3.14.10+11rc
building stable