py2exe support

Usage: setup.py py2exe
You must be able to start trimage.py before even attempting to use py2exe.
It generates a standalone executable.
That standalone exacutable starts up only if the following files can be found on the path: jpegoptim.exe optipng.exe advpng.exe (they must return 0)
Compression does not work yet and the Windows versions of these tools are a lot slower than on Linux. The binaries I found were pretty old. They should most probably be recompiled to make use of new cpu features. Or we should find other tools.

trimage.hurry.filename -> trimage.filename
because py2exe couldn't deal with it

src/trimage/filesize/filesize.py

@@ -0,0 +1,110 @@
+
+traditional = [
+    (1024 ** 5, 'P'),
+    (1024 ** 4, 'T'), 
+    (1024 ** 3, 'G'), 
+    (1024 ** 2, 'M'), 
+    (1024 ** 1, 'K'),
+    (1024 ** 0, 'B'),
+    ]
+
+alternative = [
+    (1024 ** 5, ' PB'),
+    (1024 ** 4, ' TB'), 
+    (1024 ** 3, ' GB'), 
+    (1024 ** 2, ' MB'), 
+    (1024 ** 1, ' KB'),
+    (1024 ** 0, (' byte', ' bytes')),
+    ]
+
+verbose = [
+    (1024 ** 5, (' petabyte', ' petabytes')),
+    (1024 ** 4, (' terabyte', ' terabytes')), 
+    (1024 ** 3, (' gigabyte', ' gigabytes')), 
+    (1024 ** 2, (' megabyte', ' megabytes')), 
+    (1024 ** 1, (' kilobyte', ' kilobytes')),
+    (1024 ** 0, (' byte', ' bytes')),
+    ]
+
+iec = [
+    (1024 ** 5, 'Pi'),
+    (1024 ** 4, 'Ti'),
+    (1024 ** 3, 'Gi'), 
+    (1024 ** 2, 'Mi'), 
+    (1024 ** 1, 'Ki'),
+    (1024 ** 0, ''),
+    ]
+
+si = [
+    (1000 ** 5, 'P'),
+    (1000 ** 4, 'T'), 
+    (1000 ** 3, 'G'), 
+    (1000 ** 2, 'M'), 
+    (1000 ** 1, 'K'),
+    (1000 ** 0, 'B'),
+    ]
+
+
+
+def size(bytes, system=traditional):
+    """Human-readable file size.
+
+    Using the traditional system, where a factor of 1024 is used::
+    
+    >>> size(10)
+    '10B'
+    >>> size(100)
+    '100B'
+    >>> size(1000)
+    '1000B'
+    >>> size(2000)
+    '1K'
+    >>> size(10000)
+    '9K'
+    >>> size(20000)
+    '19K'
+    >>> size(100000)
+    '97K'
+    >>> size(200000)
+    '195K'
+    >>> size(1000000)
+    '976K'
+    >>> size(2000000)
+    '1M'
+    
+    Using the SI system, with a factor 1000::
+
+    >>> size(10, system=si)
+    '10B'
+    >>> size(100, system=si)
+    '100B'
+    >>> size(1000, system=si)
+    '1K'
+    >>> size(2000, system=si)
+    '2K'
+    >>> size(10000, system=si)
+    '10K'
+    >>> size(20000, system=si)
+    '20K'
+    >>> size(100000, system=si)
+    '100K'
+    >>> size(200000, system=si)
+    '200K'
+    >>> size(1000000, system=si)
+    '1M'
+    >>> size(2000000, system=si)
+    '2M'
+    
+    """
+    for factor, suffix in system:
+        if bytes >= factor:
+            break
+    amount = int(bytes/factor)
+    if isinstance(suffix, tuple):
+        singular, multiple = suffix
+        if amount == 1:
+            suffix = singular
+        else:
+            suffix = multiple
+    return str(amount) + suffix
+