SGP/CSAPR/I7 - Reprocess: Datastream name change

The following changes have been made to the CSAPR datastream names to be consistent with 
other ARM radars.

csaprsec -> csaprppi
csaprvert -> csaprvpt

Reference: BCR-02146

• Doppler spectral width, clutter filtered(doppler_spectral_width)
• azimuth
• Clutter filtered reflectivity in vertical polarization(reflectivity_vertical)
• Reflectivity horizontal(reflectivity_horizontal)
• power_horizontal_unf
• Unfiltered lag-0 co-polar correlation coefficient(copol_coeff_unf)
• norm_coherent_power
• Mean Doppler Velocity(mean_doppler_velocity)
• power_vertical_unf
• Lag-0 co-polar correlation coefficient, clutter filtered(copol_coeff)
• Specific differential phase, clutter filtered(diff_phase)
• Unfiltered reflectivity in horizontal polarization(reflectivity_horizontal_unf)
• range
• Unfiltered specific differential phase(diff_phase_unf)
• norm_coherent_power_unf
• power_vertical
• time
• Differential reflectivity, clutter filtered(diff_reflectivity)
• Differential propagation phase shift(dp_phase_shift)
• power_horizontal
• Unfiltered Mean Doppler velocity(mean_doppler_velocity_unf)
• altitude
• Unfiltered Doppler spectral width(doppler_spectral_width_unf)
• Unfiltered reflectivity in vertical polarization(reflectivity_vertical_unf)
• Unfiltered differential reflectivity(diff_reflectivity_unf)
• Unfiltered differential propagation phase shift(dp_phase_shift_unf)