- fixed the Tcl Command AlignDrillGrid
- fixed the Tcl COmmand Panelize, Excellon panelization section
- Fixed an issue in Tool Calibration export_excellon method call
- PEP8 corrections all over the app
- made sure that the right tools go only to the intended use, in Tools Database otherwise an error status message is created and Tools DB is closed on adding a wrong tool
- fixed the usage for Tools Database in Unix-like OS's
- done some modest refactoring
- fixed the Search and Add feature in Geometry Object UI