core/signature: fixed typo that caused false positives for array argument compatibility
core/signature: fixed logic of default value processing
transformation: TransformationTree now preserves defualt values of scalar parameters
test/core/computation: fixed incorrect calls to DummyNested constructor
core/transformation: get_subtree() now preserved default values from scalar parameters
fft.mako: fixed list comprehensions which Mako does not like for some reason
fft: pylint pass
matrixmul: pylint pass