Reynir-correct

* Fix an m2 formatting error by peturorri in https://github.com/mideind/GreynirCorrect/pull/43
* S005fix by Holado in https://github.com/mideind/GreynirCorrect/pull/42
* Minimal implentation to ignore listed annotations by peturorri in https://github.com/mideind/GreynirCorrect/pull/44
* README updated; check_errors() made available from command line by Holado in https://github.com/mideind/GreynirCorrect/pull/45

**Full Changelog**: https://github.com/mideind/GreynirCorrect/compare/3.3.0...3.4.0

* Additional spell checking based on the "Ritmyndir" database
* Enhanced handling of options
* More robustness during pattern matching and generation of suggestions; fewer false positives

* New error data added and handled
* Wrapper function added
* New options added supported in wrapper function
* Grammar error handling improved
* Suggestions for specific error categories added
* Capitalization error handling updated

* Added `--grammar` switch to `correct` command, to output grammar annotations from the command line
* Annotations and suggestions polished
* Bug fixes

* Fixed erroneous grammar checking pattern in version 3.1.0

* Lots of additions to the grammar checking module, including further checks for confusion between the prepositions *að* and *af*, and checks for incorrect verb mood (indicative, *framsöguháttur* vs. subjunctive, *viðtengingarháttur*).
* Relaxed warnings for unknown capitalized words; these were generating too many false positives.
* This version depends on GreynirPackage version 3.3.0.