[rosalind] handle default and cli input in tran example
[rosalind] handle default and cli input in tran example

Quinny/perl6-examples,perl6/perl6-examples,Quinny/perl6-examples,stmuk/perl6-examples,stmuk/perl6-examples,perl6/perl6-examples,Quinny/perl6-examples,shlomif/perl6-examples,stmuk/perl6-examples,Quinny/perl6-examples,shlomif/perl6-examples,shlomif/perl6-examples,Quinny/perl6-examples,perl6/perl6-examples,shlomif/perl6-examples,stmuk/perl6-examples,stmuk/perl6-examples,shlomif/perl6-examples,perl6/perl6-examples,perl6/perl6-examples