BUG: f2py: Convert some error messages printed to stderr to exceptions.

In f2py/src/fortranobject.c, the function `check_and_fix_dimensions` does
pretty much what it says on the tin:
    /*
      This function fills in blanks (that are -1\'s) in dims list using
      the dimensions from arr. It also checks that non-blank dims will
      match with the corresponding values in arr dimensions.
    */
There are several error conditions detected by the function.  In the code
before this change, when the function detected such an error, it would
print a message to stderr and return 1.

In this change, when an error is detected in `check_and_fix_dimensions`,
an exception is set.

This new feature of `check_and_fix_dimensions` is used in three places
in the function `array_from_pyobj()`.
In each case, there was an old comment of the form:
    /* XXX: set exception */
In this change, the exception is now set in `check_and_fix_dimensions()`,
so those comments have been removed.

For some error conditions, the new code changes the exception that is
raised.  For example, here's a scipy test before this change:

```
In [5]: from scipy.linalg import _fblas as fblas

In [6]: a = np.array([[1., 0.], [0., -2.], [2., 3.]])

In [7]: b = np.array([[0., 1.], [1., 0.], [0, 1.]])

In [8]: fblas.dsyr2k(a=a, b=b, alpha=1.0, c=np.zeros((15, 8)))
0-th dimension must be fixed to 3 but got 15
---------------------------------------------------------------------------
error                                     Traceback (most recent call last)
<ipython-input-8-bc4d51f8d016> in <module>()
----> 1 f(a=a, b=b, alpha=1.0, c=np.zeros((15, 8)))

error: failed in converting 2nd keyword `c' of _fblas.dsyr2k to C/Fortran array
```

After this change, we get:

```
In [2]: from scipy.linalg import _fblas as fblas

In [3]: a = np.array([[1., 0.], [0., -2.], [2., 3.]])

In [4]: b = np.array([[0., 1.], [1., 0.], [0, 1.]])

In [5]: fblas.dsyr2k(a=a, b=b, alpha=1.0, c=np.zeros((15, 8)))
---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<ipython-input-6-bc4d51f8d016> in <module>()
----> 1 f(a=a, b=b, alpha=1.0, c=np.zeros((15, 8)))

ValueError: 0-th dimension must be fixed to 3 but got 15
```

The spurious print has been changed to the exception message, but some
potentially useful information in the old exception message has been
lost.

0 files changed, 0 insertions, 0 deletions