Issues with sObject and field creations

sObject creation
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Fixed issue about always trying to add field when creating an sObject
even if no field was defined on cmd-line. The fields where also
attempted to be created twice. No field options where respected.

Custom Field creation
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The NumberField struc did not contain all the fields and this stopped
creation of these fields. Numeric and float field does not support a
length attribute (API restriction). Member was removed from structs.

Display text where corrected. Length removed and description of Precision
and Scale seemed to have been swapped.