last_fancy -n rows and filtering

[Sergey Naumov]

Hello.

Here is a first version of patch to last_fancy to support -n
<rows_to_show> flag and filtering by provided command line arguments.
Of course all changes are conditional.

bloat-o-meter (unselected conditionals vs unpatched busybox):
function                                             old     new   delta
last_main                                            860     870     +10
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/0 up/down: 10/0)               Total: 10 bytes

bloat-o-meter (selected conditionals vs unpatched busybox):
function                                             old     new   delta
show_entry                                           276     381    +105
last_main                                            860     889     +29
.rodata                                             1574    1580      +6
static.rows_shown                                      -       4      +4
rows_to_show                                           -       4      +4
filters                                                -       4      +4
------------------------------------------------------------------------------
(add/remove: 3/0 grow/shrink: 3/0 up/down: 152/0)             Total: 152 bytes

Code could be shrinked a bit if we will not support -n 0 case as "show
all" but "show nothing".
Any suggestions are welcomed.

Thanks in advance,
Sergey Naumov.
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