Dev/ctb clocks fix (#1434)

* introduced new type Hz, typetraits, String conversions, command generation (not yet generated)

* incorrect unit typo

* cmd generation and compiles

* default to MHz, removed space between units for consistency with timers, min and max checks for clks

* in python, but need to change the default to Hz again for clean code and intuition

* allow ints, doubles, implicit conversions

* dont allow raw ints, doubles and implicit conversions

* fixed tests

* added operators for Hz in python

* fix test for min clk for xilinx ctb

* fix test

* fix python tests

* fixed xilinx period and default clks

* test fix

* removed the 3 clock cycle check for ctb and implemented properly the max adc clk frq for altera ctb

* removing 3 clock cycle code from xilinx as well

* formatting

* loadpattern before 3 clk cycles code

* actualtime and measurement time to be implemented in 100ns already in fw

* fix tests

* pyzmq dependency forthe tests

* fixed pyctbgui for freq

python/slsdet/__init__.py

@@ -34,6 +34,9 @@ scanParameters = _slsdet.scanParameters
 currentSrcParameters = _slsdet.currentSrcParameters
 DurationWrapper = _slsdet.DurationWrapper
 pedestalParameters = _slsdet.pedestalParameters
+Hz = _slsdet.Hz
+kHz = _slsdet.kHz
+MHz = _slsdet.MHz
 
 import os
 def read_version():