Load multiple frames from the PCAP file.

Only one frame was loaded in the PCAP file. We now load the frames until
the EOF.
Add a dirty flag for PCAP modification.

Until now the PCAP file was always overwritten. In case of a bug this
resulted in a corrupted PCAP file.
Display addresses correctly in the pcap-selector.

The frames were not shown correctly because the display functions added
an newline for the display function.
Add the sequence number and display time correctly.

The pcap-selector did not show the sequence number. The time was not
shown correctly, we now use a manual representation of the time directly
from the timeval value in the frame.
Change the mark for the current frame in the pcap list.

The PCAP list used the same mark for the current cursor and the command
prompt. This patch uses a star instead.
Fix the index in the default text UI.

The cursor position and goto command were incorrect in the default text
UI. They were shifted one step forward. This patch fix this patch fixes
this and set the cursor position and goto command to the correct
position.