[libdc] Bye bye byte_per_packet

[Damien D. <ddo...@is...>]

Hi all,

I have renamed "byte_per_packet" to "packet_size" across the whole
library (SVN 469). The old name was also sometimes written
"bytes_per_packet" or "packet_bytes" so we gain both in consistency and
readability. We can also now start to use "BPP" as bits per pixel
without confusion.

This resulted in "a number" of changes, namely:

In the format7 struct:
- bpp -> packet_size
- min_bpp -> unit_packet_size (this is the unit, not only the min)
- max_bpp -> max_packet_size

In the video frame struct:
- bytes_per_packet -> packet_size

Format7 functions:
- *_get_packet_para                 -> *_get_packet_parameters
- *_get/set_byte_per_packet         -> *_get/set_packet_size
- *_get_recommended_byte_per_packet -> *_get_recommended_packet_size
- *_get_packet_per_frame            -> *_get_packets_per_frame

Some of these changes are debatable, like the last one where only an "s"
is added, but I think help people understand the code.

If I went too far in this crusade don't hesitate to let me know ;)

-- 
Damien 高原 Douxchamps
Assistant Professor, Image Processing Laboratory, NAIST
http://damien.douxchamps.net/