[PATCH] new expand / unexpand applets

[Tito]

Hi to all,
this patch adds 2 new applets to coreutils: expand and unexpand
They are turned off by default and can be turned on independently.
There are also some tests added to the testsuite to ensure
that they work like their GNU counterparts.
The applets are tested but more testing by the community would not be bad. 
Hints, improvements, optimizations and critics are wellcome.

bloat-o-meter says:
1) busybox defconfig + expand (with long opts)
function                                             old     new   delta
expand_main                                            -     456    +456
.rodata                                           120397  120525    +128
packed_usage                                       22558   22660    +102
xputchar                                               -      25     +25
static.expand_longopts                                 -      18     +18
applets                                             3108    3120     +12
------------------------------------------------------------------------------
(add/remove: 3/0 grow/shrink: 3/0 up/down: 741/0)             Total: 741 bytes

2)  busybox defconfig + unexpand (with long opts)
function                                             old     new   delta
expand_main                                            -     554    +554
.rodata                                           120397  120557    +160
packed_usage                                       22558   22652     +94
static.unexpand_longopts                               -      27     +27
xputchar                                               -      25     +25
applets                                             3108    3120     +12
------------------------------------------------------------------------------
(add/remove: 3/0 grow/shrink: 3/0 up/down: 872/0)             Total: 872 bytes

3)  busybox defconfig + expand (with long opts) + unexpand (with long opts)
function                                             old     new   delta
expand_main                                            -     772    +772
.rodata                                           120397  120621    +224
packed_usage                                       22558   22717    +159
static.unexpand_longopts                               -      27     +27
xputchar                                               -      25     +25
applets                                             3108    3132     +24
static.expand_longopts                                 -      18     +18
------------------------------------------------------------------------------
(add/remove: 4/0 grow/shrink: 3/0 up/down: 1249/0)           Total: 1249 bytes

3)  busybox defconfig + expand (without long opts) + unexpand (without long opts)
function                                             old     new   delta
expand_main                                            -     752    +752
.rodata                                           120397  120589    +192
packed_usage                                       22558   22717    +159
xputchar                                               -      25     +25
applets                                             3108    3132     +24
------------------------------------------------------------------------------
(add/remove: 2/0 grow/shrink: 3/0 up/down: 1152/0)           Total: 1152 bytes


Ciao,
Tito
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