hdl/modules/position_calc/*/virtex6/*: fix wrong TBT values

Due to a wrong truncation in the TBT chain, its amptlitudes
and position values were wrongly calculated
hdl/modules/position_calc/*/artix7/*: fix wrong TBT values

Due to a wrong truncation in the TBT chain, its amptlitudes
	and position values were wrongly calculated.
hdl/modules/*position_calc/*: add pipeline generic

This introdecus the possibility to choose between 1 to 8
the number of pipeline registers in the clock enable nets

Also, an MAX_FANOUT attribute was added in wb_position_calc_core.vhd
to reduce the clear signal fanout.
hdl/modules/dsp_cores_pkg.vhd: add pipeline generic

Add pipeline generic to modules interface