@CO	Testing explicit vs implicit base modifications.
@CO	This covers the case where a lack of a signal could be either
@CO	implicitly assumed to be no-mod (default) or assumed to be
@CO	unchecked and require an explicit statement to indicate it was
@CO	looked at and no base modification was observed.
@CO	
@CO	ATCATCATTCCTACCGCTATAGCCT  r1; implicit
@CO	  -  -   ..  -. -     --
@CO	         Mm   M
@CO	  -  -   ..  -. -     --
@CO	         hH   h
@CO	
@CO	ATCATCATTCCTACCGCTATAGCCT  r2; explicit to a small region
@CO	  -  -   ??  ?? ?     --
@CO	         Mm  mM m
@CO	  -  -   ??  ?? ?     --
@CO	         hH  hh h
@CO	
@CO	ATCATCATTCCTACCGCTATAGCCT  r3; mixture
@CO	  -  -   .   -. -     --
@CO	         M    M
@CO	  -  -   ??  ?? ?     --
@CO	         hH  hh h     --
@CO	
r1	0	*	0	0	*	*	0	0	ATCATCATTCCTACCGCTATAGCCT	*	Mm:Z:C+mh,2,0,1;	Ml:B:C,200,10,50,170,160,20
r2	0	*	0	0	*	*	0	0	ATCATCATTCCTACCGCTATAGCCT	*	Mm:Z:C+mh?,2,0,0,0,0;	Ml:B:C,200,10,50,170,10,5,160,20,10,5
r3	0	*	0	0	*	*	0	0	ATCATCATTCCTACCGCTATAGCCT	*	Mm:Z:C+m.,2,2;C+h?,2,0,0,0,0;	Ml:B:C,200,160,10,170,5,20,5
