Delete selectied text onl typing.
Customize style of highlighting for expressions (between parens)
Plugin "color-themes" was added to configuration.
Created user defined theme "bjakushka". This theme are being used by default.
Special settings for graphical emacs were added:
  1. Highlighting current line and styling for it;
  2. Colors for highlighted expression.

Bold style for highlighted expression in textual emacs were removed.