REPORTS-129 - update CTX rule with correct start / stop concepts
amrsreports: changing columns to data definition.
amrsreports: adding voided clause to the query.
amrsreports: changing the substitution string.
amrsreports: adding pmtct data definition
amrsreports: minor fixes on start stop drug evaluator
amrsreports: minor fixes on pmtct evaluator.
amrsreports: displaying only the first pair for the start and stop drug.
Merge pull request #57 from nribeka/data-definition

Changing logic columns to data definition.
REPORTS-136 - minor fix related to RTC date
REPORTS-101 - adding columns for last HIV encounter
fixing PMTCT multi value rendering
removing Unknown-Unknown from drug date columns
cleaning up code
converting Date and Reason Eligible for ART to a data definition
converting Date ART Started to a data definition
moved snapshot tests to snapshot package
moved some util methods out of rule utils into report utils
REPORTS-108 - added Transfer Status data definition
additional fixes with util method switcheroo