all fields are labeled
ritcher tests for output definition dsl
base output adapter simplified
DataField merged into Field
field filter
Fixes #4231 - base adapter - skip blank values
Fixes #4384 - set width to columns in table adapter
support for fields containing multiline text

Based on requirement from katello guys. Useful for gpg keys etc.
Merge pull request #87 from tstrachota/fields

Fixes #4231 and	#4384 - output adapter issues