emc2.1.3 released

bugfixes, new translations, improvements:
* make 'load' button work in classicladder
* add french translation of axis
* improve italian translation of axis
* make 'milltask' not consume all CPU after 'run from line' has been used
* new userspace component: hal_input for all Linux-recognized input devices
* image-to-gcode: spindle speed and plunge feed rate can now be selected
* image-to-gcode: tool shape compensation bugfixes
* image-to-gcode: add documentation
* stepgen: revise core to eliminate 1 count deadband and resulting "bobbles"
* improve segment throughput for slow machines when using AXIS
* fix cutter compensation sticky words when using zero radius tool
* fix incorrect path in some circumstances after G40 in lathe mode
* in AXIS, unhighlight a program line that was chosen interactively when starting a program. this way, the highlight follows the running program.
* fix some misformatted/truncated error messages