fix zoom-in/zoom-out using mouse wheel

regression introduced by 2393:235f847be37e "python3 support: pylint, W1619 #(old-division) division w/o __future__ statement"

better pylint complain workaround

check_sources.sh makes me become even less productive

Added stub axis_s type in EtherLAB CiA402 support code, until Motion Contol Library comes back

Allow using one XSD based target description for many targets. Target description XSD can now use %(target_name)s to refer to target name.

Fix previous commit : Using wx.CallAfter shouldn't have been necessary, and was a symptom of failing evaluator's deadlock detection.

Fix startup of wxGlade base HMI. Wx calls were issued from non-wx thread (main).

Reworked chunk based transfer to support duplicated files (i.e. files with same content, but different names)

Fixed deadlock in runtime's Worker. Was discovered while using WAMP and PYRO simultaneously.

Add a debugger token to SetTraceVariables and GetTraceVariables to prevent crash an inconsistant data in case of multiple connections. Last connection now takes over existing connections's debug, and first connected IDE gets a wrning.

Fixed deadlock when using Wx together with Twisted in runtime.

Split IDE's frame OnCloseFrame() into TryCloseFrame() and OnCloseFrame(), to help further customization

fixed exception happening randomly just after showing discovery panel.

fixed exception happening when connecting to empty URI, and set URI through URI Editor Dialog popping up becaue empty.

Merged Mario's modbus fix : Modbus plugin: reset periodic activation timer when overrun occurs (delays due to communication errors, ...)