add progress bar to status bar

It can be used to display progress during program upload.
To use it call ShowPLCProgress (like ShowPLCProgress("transfered",
10)) in your PLCObject implementation.

fix warning: 'return' with no value in function startPLC

fix inconsistent whitespace

fix license notices in source files and license files under GPLv2+

Previously a lot of files were referenced to GNU Public License 2.1,
which never existed.
All copyright attributions are kept the same.

fix PLC autostart option for Beremiz_service.py

remove old debug code

fix wrong font family in CustromGrid control

closes #10

now only correct chart can be created in SFC Viewer

if user trying to connect incompatible blocks (by IEC 61131-3 standard), wire highlight will become red

add Russian translations for About dialogs

make about dialog boxes use standard wx about dialogs

Any information in dialog can be easily changed without much effort
and the dialog can be easy translated.

Unfortunately on Windows there is no good standard about dialog,
therefore own implementation is used there.

fix highlighting error and warning messages with non-lating characters

fix breaking non-latin description and comments in FBD, LD, SFC and
project settings after Undo operation

fix borders of pull-down choice list box in Config tab, in Project Properties

add version.py needed for previous commit '4ce8492'

add version with commit hash to 'About' dialogs for Beremiz IDE and PLCOpenEditor

ignore generated bugreports and output of i18n script