Fix for the definition of miget_dimension_sizes.

The full definition from MINC-2.2.00 is:

    extern int miget_dimension_sizes(const midimhandle_t dimensions[], int array_length,
                 unsigned int sizes[]);

The definition in libpyminc2.py has int_sizes (C's unsigned long long)
for the last parameter, but it should be uint_sizes.

Test script:

    from pyminc.volumes.factory import *
    import numpy as np
    import os

    tmp = '/tmp/test.mnc'

    try:
        os.remove(tmp)
    except OSError:
        pass

    shape = (10, 20)

    vol = volumeFromDescription(tmp, ['yspace', 'xspace'], shape, [-5, -5], [0.2, 0.2])
    vol.data = np.random.random(shape)
    print vol.data.shape # should say (10, 20)
    vol.writeFile()
    vol.closeVolume()

Result:

    $ python test_creation.py
    Traceback (most recent call last):
      File "test_creation.py", line 15, in <module>
        vol.data = np.random.random(shape)
      File "/usr/local/lib/python2.7/dist-packages/pyminc/volumes/volumes.py", line 63, in setdata
        raise IncorrectDimsException
    pyminc.volumes.volumes.IncorrectDimsException

After the fix:

    $ python test_creation.py
    (10, 20)

I tested scripts/pyminc_test2.py and it seemed to run successfully:

    $ ./pyminc_test2.py /tmp/test.mnc numpy /tmp/test_out.mnc
    4
    Opening volume took 0.01000 seconds
    Voxel: 0.000000
    sizes: 110 217 181
    0
    Getting hyperslab took 0.15000 seconds
    55
    0
    (4320470,)
    (110, 217, 181)
    0
    computing ten neighbourhood averages using numpy method
    Iterations 0 took 0.260 seconds
    Iterations 1 took 0.230 seconds
    Iterations 2 took 0.220 seconds
    Iterations 3 took 0.230 seconds
    Iterations 4 took 0.230 seconds
    Iterations 5 took 0.220 seconds
    Iterations 6 took 0.230 seconds
    Iterations 7 took 0.230 seconds
    Iterations 8 took 0.220 seconds
    Iterations 9 took 0.230 seconds
    done averaging. Took a total of 2.300 seconds, averaging 0.230 seconds
    before volume
    after volume
    max and min 87 0
    (110, 217, 181)
    Creating new volume took 0.36000 seconds
    before setting hyperslab
    0
    0.0
    0 255 0 63.2519589304
    int32 uint8
    [[[0 0 0 ..., 0 0 0]
      [0 0 0 ..., 0 0 0]
      [0 0 0 ..., 0 0 0]
      ...,
      [0 0 0 ..., 0 0 0]
      [0 0 0 ..., 0 0 0]
      [0 0 0 ..., 0 0 0]]

     [[0 0 0 ..., 0 0 0]
      [0 0 0 ..., 0 0 0]
      [0 0 0 ..., 0 0 0]
      ...,
      [0 0 0 ..., 0 0 0]
      [0 0 0 ..., 0 0 0]
      [0 0 0 ..., 0 0 0]]

     [[0 0 0 ..., 0 0 0]
      [0 0 0 ..., 0 0 0]
      [0 0 0 ..., 0 0 0]
      ...,
      [0 0 0 ..., 0 0 0]
      [0 0 0 ..., 0 0 0]
      [0 0 0 ..., 0 0 0]]

     ...,
     [[0 0 0 ..., 0 0 0]
      [0 0 0 ..., 0 0 0]
      [0 0 0 ..., 0 0 0]
      ...,
      [0 0 0 ..., 0 0 0]
      [0 0 0 ..., 0 0 0]
      [0 0 0 ..., 0 0 0]]

     [[0 0 0 ..., 0 0 0]
      [0 0 0 ..., 0 0 0]
      [0 0 0 ..., 0 0 0]
      ...,
      [0 0 0 ..., 0 0 0]
      [0 0 0 ..., 0 0 0]
      [0 0 0 ..., 0 0 0]]

     [[0 0 0 ..., 0 0 0]
      [0 0 0 ..., 0 0 0]
      [0 0 0 ..., 0 0 0]
      ...,
      [0 0 0 ..., 0 0 0]
      [0 0 0 ..., 0 0 0]
      [0 0 0 ..., 0 0 0]]]
    Setting hyperslab took 0.09000 seconds

    $ mincstats /tmp/test.mnc
    File:              /tmp/test.mnc
    Mask file:         (null)
    Total voxels:      4320470
    # voxels:          4320470
    % of total:        100
    Volume (mm3):      4320470
    Min:               0
    Max:               102.5024482
    Sum:               102940629.4
    Sum^2:             5570867979
    Mean:              23.82625718
    Variance:          721.7221255
    Stddev:            26.86488648
    CoM_voxel(z,y,x):  42.81716948 105.8562036 90.67176645
    CoM_real(x,y,z):   0.6717664491 -20.14379639 30.81716948

    Histogram:         (null)
    Total voxels:      4320470
    # voxels:          4320470
    % of total:        100
    Median:            0.03855289613
    Majority:          0.02562561259
    BiModalT:          28.26505089
    PctT [  0%]:       0.02562561259
    Entropy :          5.90236189

    $ mincstats /tmp/test_out.mnc
    File:              /tmp/test_out.mnc
    Mask file:         (null)
    Total voxels:      4320470
    # voxels:          4320470
    % of total:        100
    Volume (mm3):      4320470
    Min:               0
    Max:               87
    Sum:               93236088.69
    Sum^2:             4408692362
    Mean:              21.58008011
    Variance:          554.7198926
    Stddev:            23.55249228
    CoM_voxel(z,y,x):  42.56045625 105.8436785 90.68415457
    CoM_real(x,y,z):   0.6841545723 -20.15632149 30.56045625

    Histogram:         (null)
    Total voxels:      4320470
    # voxels:          4320470
    % of total:        100
    Median:            8.808750357
    Majority:          0.02174999937
    BiModalT:          24.90374947
    PctT [  0%]:       0.02174999937
    Entropy :          3.946002744

Note: all testing was done on Debian Wheezy 64bit; I got segfaults
on Debian Wheezy 32bit with the latest commit and also my patches.
Is pyminc compatible with 32bit systems?