Hi,

Is there a way I can introduce mutation in bam file at specific position of a chromosome without running the alignment. For example I would like to change base from A>C at Chr1:12345?

I quickly wrote: http://lindenb.github.io/jvarkit/Biostar404363.html 


```
$ samtools view src/test/resources/toy.bam | tail -1
x6	0	ref2	14	30	23M	*	0	0	TAATTAAGTCTACAGAGCAACTA	???????????????????????	RG:Z:gid1

$ cat jeter.vcf
ref2	14	A	C

$ java -jar dist/biostar404363.jar -p jeter.vcf src/test/resources/toy.bam | tail -1
x6	0	ref2	14	30	23M	*	0	0	CAATTAAGTCTACAGAGCAACTA	???????????????????????	PG:Z:0	RG:Z:gid1	NM:i:1
```
