coreCT version 1.3.3 (release date: 2021-02-05)
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Changes:
* getRoots() and deprecated function rootSize() merge data after verifying column names and order.


coreCT version 1.3.2 (release date: 2019-11-27)
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Changes:
* renames the primary functions: convert, convertDir, getRoots, getRootsDir
* includes deprecated versions of these functions (conv, convDir, rootData, rootDataDir) that directly replicate the manual classification method originally used in Davey et al. 2011



coreCT version 1.3.1 (release date: 2019-09-28)
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Changes:
* coreHist returns a summary of the calibration curve used to convert Hounsfield Units to densities
* surface area calculations in rootSize corrected to avoid artificially reporting NAs
* convDir function now sends all necessary arguments to rootSize
* rootSize updated: surface area calculation made more efficient in use of raster::freq



coreCT version 1.3.0 (release date: 2019-09-22)
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Changes:
* calibration curve for converting Hounsfield Units to densities now accommodates more than four calibrants
* input style for calibration rods has changed to ensure sediment components are partitioned following the density divisions in Davey et al. 2011. Calibration rods and are used to develop the calibration curve. Separately, the densities used for partitioning in Davey et al. 2011 (0.0012, 1, 1.23, 2.2 g/cm3) are converted to Hounsfield Units and used for partitioning sediment components.
* calibration curve summary is reported to console if r2 < 0.95. 



coreCT version 1.2.4 (release date: 2019-01-03)
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Changes:
* added unit tests
* minor text edits 


coreCT version 1.2.3 (release date: 2018-06-24)
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Changes:
* bug fix in conv(): categories with NAs are excluded from calculation of total masses, volumes, etc.


coreCT version 1.2.1 (release date: 2017-09-02)
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Changes:
* Added coreHist(), a function that returns and plots the frequency distribution of Hounsfield units in an image series
* Efficiency improvements were made to conv()
