Bugfix - -of value considered as a file input

Which produced a message saying SharpLinter was ignoring a non existent
file
Bugfix - -of: "at character " appears in {4}

The doc states that it contains the number of the character where the
error occurs, but it also contains the string "at character ", making it
difficult to use with custom output formatting.
Merge pull request #8 from nop00/master

Output format bugfixes