pybag v0.5.0 released

• Fix GUI for work in wxPython 4.0.
• Colorize output in console.
• Add option "-x" for mark roots as "default" (see commands --add, --dist, --sync, --stat). In GUI also add option for mark roots default.
• In GUI now add menu "File->Clean DB" (cli already have this command).
• In GUI roots list is now bigger.