Avoid just-in-time compilation when not needed * inst/private/check_hash.m: check whether the previous compilation used the same ufl file * inst/private/save_hash.m: save to disk ufl file's md5sum for future comparison * inst/private/check_oct_files.m: ensure the expected oct files are present * inst/import_ufl_*.m: add checks using the logic above

Summary of important user-visible changes for fem-fenics 0.0.1:
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 ** 0.0.1 is a version compliant with FEniCS 1.3.0

Summary of important user-visible changes for fem-fenics 0.0.0:
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 ** 0.0.0 is a pkg for the resolution of pde