Reducing memory usage by saving fewer time stamps in frame_data

[Guy Harris <guy () alum mit edu>]

On May 10, 2012, at 1:24 AM, Anders Broman wrote:

> Reduce Memory usage:
> - In frame_data.h it should be possible to cut down on the nstime_t structures by only having abs_ts and the others 
> could be offsets to that or something similar thus saving a couple of bytes per packet.

"Time since first packet" is straightforward to calculate if, for example, the time stamp of the first packet is stored 
in the capture_file structure for the file.

"Time since previous captured packet" is straightforward to calculate given the current packet's frame_data structure 
and the previous packet's frame_data structure (which is straightforward to find if you know the current packet's frame 
number - if the frame number is 1 "time since previous captured packet" is your choice of 0 or "leave it blank because 
it's inapplicable" and if it's > 1 then it's the value for frame N-1).

"Time since previous displayed packet" is a bit more work - you have to scan backwards through frames until you either 
hit one with flags.passed_dfilter set or run out of frames (in which case the answer is either 0 or "leave it blank 
because it's inapplicable").
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