Merge branch 'dos2unix' into 'master'

Silence dos2unix errors

The result is that if it 1) doesn't exist, or 2) exits with error, we
don't quit making the submit file. This includes weird cases such as
permission being denied on certain directories.

It's really hard to imagine dos2unix legitimately failing, and even if
it does, the autograder should be already changing CRLF to LFs in its
test case normalization process.

See merge request !2

Makefile

@@ -132,7 +132,7 @@ clean:
 PARTIAL_SUBMITFILES=$(filter-out $(TESTSOURCES), $(wildcard Makefile *.h *.cpp))
 $(PARTIAL_SUBMITFILE): $(PARTIAL_SUBMITFILES)
 	rm -f $(PARTIAL_SUBMITFILE) $(FULL_SUBMITFILE)
-	dos2unix $(PARTIAL_SUBMITFILES)
+	-dos2unix $(PARTIAL_SUBMITFILES)
 	tar -vczf $(PARTIAL_SUBMITFILE) $(PARTIAL_SUBMITFILES)
 	@echo !!! WARNING: No test cases included. Use 'make fullsubmit' to include test cases. !!!
 
@@ -140,7 +140,7 @@ $(PARTIAL_SUBMITFILE): $(PARTIAL_SUBMITFILES)
 FULL_SUBMITFILES=$(filter-out $(TESTSOURCES), $(wildcard Makefile *.h *.cpp test*.txt))
 $(FULL_SUBMITFILE): $(FULL_SUBMITFILES)
 	rm -f $(PARTIAL_SUBMITFILE) $(FULL_SUBMITFILE)
-	dos2unix $(FULL_SUBMITFILES)
+	-dos2unix $(FULL_SUBMITFILES)
 	tar -vczf $(FULL_SUBMITFILE) $(FULL_SUBMITFILES)
 	@echo !!! Final submission prepared, test cases included... READY FOR GRADING !!!
 
@@ -215,4 +215,4 @@ project0.o: project0.cpp class.h
 # these targets do not create any files
 .PHONY: all release debug profile clean alltests partialsubmit fullsubmit help
 # disable built-in rules
-.SUFFIXES:
\ No newline at end of file
+.SUFFIXES: