Fixed FileProject.delete() bug. Preparing for libpit 1.1.6

issues/libpit/0018c4.rst

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+FileProject.delete() does not handle sub-projects correctly.
+============================================================
+
+FileProject.delete() deletes the project directory if the directory is empty,
+but fails to do so if the directory is not empty.
+
+Initial Recommendation
+----------------------
+
+Loop through the issues and delete the files, loop through the projects and
+call Project.delete(). Alternatively, use File.deleteDir() rather than
+File.delete()

issues/libpit/0019t4.rst

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+Add unit tests for FileIssue.delete()
+=====================================

issues/libpit/0020t4.rst

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+Add unit tests for FileProject.delete()
+=======================================