Add CSV-output to mmls

[jgru]

Dear sleuthkit-maintainers,

this patch adds the ability to mmls to print its output in CSV-format.

Even though the conversion of mmls' current output to CSV could be easily achieved with Unix tools [1] I find it convenient to have the ability to output comma-separated values directly. Therefore, this patch introduces a new command line switch -c to instruct mmls to output CSV.

Exemplary usage:

./mmls -c -i ewf ~/Downloads/nps-2008-jean.E01 | csvlook 

ID	Slot	Start	End	Length	Description
0	Meta	0	0	1	Primary Table (#0)
1		0	62	63	Unallocated
2	000:000	63	20,948,759	20,948,697	NTFS / exFAT (0x07)
3		20,948,760	20,971,519	22,760	Unallocated

Thanks for looking at and eventually considering to add this patch.

Best regards,
jgru

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[1] E.g., mmls img.e01 | tail -n+5 | cut -c 7- | sed 's/\s\{2,\}/,/g'