Add resident $DATA of NTFS to tsk_file_layout

[paul1278]

When using loaddb, all files of an NTFS file-system will be available on the tsk_file_layout table. Except for resident-files, they are missing there. I noticed this while I was working with this table and needed to extract the location for all files.

This PR adds those files to the tsk_file-layout-table, the byte_start & byte_len will point directly to the resident $DATA-buffer, the sequence is always 0. This allows complete transparent processing of those file-layouts, including extractions of files from the image.

It does this by calculating the offset in bytes relative to the start of the file-system (TSK_FS_ATTR.rd.offset) on NTFS file-systems. When I introduced new parameters to heavily used functions, I made an override for them to maintain compatibility.

This implementation works for my cases, I don't know if it works on all edge cases though.