Add digitized clad temperature data of Test 234 (1)

 - Digitized from figure ``234_02_cladding_temperature_1.jpg`` located
   in the ``figures`` folder using PlotDigitizer 2.6.6 for Windows
 - Corresponds to clad temperature measurement at 3860, 3315, 2770,
   2225, 1680, 1135, 590, and 45 [mm]
Add digitized clad temperature data of Test 234 (2)

 - Digitized from figure ``234_03_cladding_temperature_2.jpg``
   located in ``figures`` folder using
   PlotDigitizer v2.6.6 for Windows
 - Corresponds to clad temperature at elevation 2425, 2325, and
   2125 [mm]
 - Elevation 2225 [mm] is also available again on the plot and it
   actually corresponds to measurement in a different rod.
   However, the TRACE model is one-dimensional so such information
   is redundant and only the clad temperature measurement at
   2225 [mm] in ``234_02_cladding_temperature_1.jpg`` is digitized
Add digitized clad temperature of Test 234 (3)

 - Digitized from figure ``234_04_cladding_temperature_3.jpg``
   using PlotDigitizer v.2.6.6 for Windows.
 - Corresponds to cladding temperature at 2025 [mm].
 - In the figure, for the same elevation, there were 3 different
   thermocouple measurements correspond to three different radial
   locations. This information is irrelevant for a one-dimensional
   model and TC 13d3 was chosen to represent TC measurement at
   2025 [mm].
Add digitized clad temperature of Test 234 (4)

 - Digitized from figure ``234_05_cladding temperature_4.jpg`` using
   PlotDigitizer v2.6.6 for Windows.
 - Corresponds to cladding temperature at elevation 1925, 1825, 1725,
   1625 [mm]
Add digitized pressure drop data of Test 234

 - Digitized from figure ``234_08_pressure_drop.jpg`` using
   PlotDigitizer v2.6.6 for Windows
Add digitized quench front data of Test 234

 - Digitized from figure ``234_10_quench_front.jpg`` using
   PlotDigitizer v2.6.6 for Windows
Add digitized housing temperature data of Test 234

 - Digitized from figures ``234_06_fluid_housing_1725.jpg`` and
   ``234_07_fluid_housing_1625.jpg`` using PlotDigitizer v2.6.6
   for Windows
 - Correspond to measurement at axial level 1725 [mm] and 1625 [mm]
Add digitized fluid temperature data of Test 234

 - Digitized from figures ``234_06_fluid_housing_1725.jpg`` and
   ``234_07_fluid_housing_1625.jpg`` using PlotDigitizer v2.6.6
   for Windows.
 - Correspond to measurement at axial level 1725 [mm] and 1625 [mm].
 - Note that from the figures, fluid temperature measurement is very
   noisy and certain degree of arbitrary smoothing during digitizing
   procedure cannot be avoided.
Add digitized liquid carryover data of Test 234

 - Digitized from figure ``234_09_coolant_outlet_conditions.jpg`` using
   PlotDigitizer v2.6.6 for Windows.
Add digitized coolant inlet temp. of Test 234

 - Digitized from figure ``234_01_boundary_conditions.jpg`` using
   PlotDigitizer v2.6.6 for Windows
Add digitized outlet temperature data of Test 234

 - Digitized from figure ``234_09_coolant_outlet_conditions.jpg``
   using PlotDigitizer v2.6.6 for Windows