This reverts commit 12242ed1, reversing
changes made to 261ebf6a.

Fixed bug related to sc_time showing SC_S instead of SC_SEC and a bug when using microseconds and invalid characters were generated in the syscams code. (syscams)
Fixed bug related to delays in input converter ports and current TDF time going negative. (syscams)
Fixed bug with Fraction conversion, using BigFraction instead of Fraction. (syscams)

Fixed Timestep type to be double instead of int for all TDF blocks and their ports. Implemented validation of TDF module parameters Tm, Tp, Rate and Delay in order to propagate timesteps automatically to all TDF blocks.

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