1.0.0   This script perform unit tests on TWO (2) functions in source "PlusMtr.R":
               (a) MtrFindCmtDfr(); and (b) MtrIsComment(). Todo: Unit tests for FIVE (5)
               functions: (i) MtrConvertStr(); (ii) MtrFindLoopDfr(); (iii) MtrFindFunDfr();
               (iv) MtrBetweenLoopDfr(); and (v) MtrBetweenFunDfr().