added NAME_ALIAS naming to workflow. names like NAME_ALIAS4569 are acceptable replacements
fixed AttributeRecord::cellByKey to actually write the value to cell

fixed IlwisTypes convenience comments
Merge remote-tracking branch 'origin/master'
renamed _bounds to _envelopes since even its getter and setter are called likewise
Merge commit '07ee89d031bd7818bf72b26867c791db213b8599'
prepare input raster coverage and initialize output raster