Not add white spaces in tests for octave %!

[loisspitz]

For built in test in Octave starting with %!test at the end of a file. Miss_hit does add an whitespace which beaks the tests. Implemented like the detection of pragma only executed when octave. The behavior is only changed when the language is set to to octave. Therefore a new parameter language.infile_tests is introduced. I hope this follows the intensional structure of miss_hit.