security checks for sourceFilePath -- fixes bug #970.
* Utils.pm: add path_is_subdir
* Problem.pm: use path_is_subdir to check sourceFilePath
fix logic on when to use sourceFilePath
* ProblemSet.pm: use path_is_subdir to check sourceFilePath
add permissions check around sourceFilePath handler
* ProblemSets.pm: use path_is_subdir to check sourceFilePath
* GatewayQuiz.pm: remove code to preserve editMode/sourceFilePath (not used)
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branches/rel-2-2-dev/webwork-modperl/lib/WeBWorK/ContentGenerator/GatewayQuiz.pm