catch MessageException if MiKTeX version can't be obtained
print a warning message if PS specials are found but ignored
avoid output of empty parentheses if TARGET_SYSTEM is not set
added information about 'dvisvgm -E' to usage line
added missing member initializations to some classes
added missing underscores to private member variables
fixed bracketing bug that prevented lookup of fontmap files
set version to 1.2.2
updated NEWS
Added tag 1.2.2 for changeset 4d3d07090101