Previously, the dlamch function was a manually-edited file, precluding
autogeneration. We fix this by putting the manual edits in a patch file, and
then generating f2c_config.c from install/*.f, which includes dlamch.

While these functions exist in more than once place in lapack 3.0.0, they only
exist in lapack/install in newer versions. A side effect of this is that some
functions have been pulled out of `f2c_blas.c` and `f2c_s_lapack.c` into this
new file.

The edits in the patch were introduced in cadbb5f2ec84cb774023bbe8cbe6f39a93e837d7,
for a reason that is lost to time.

Also uses this splitting as an excuse to ditch the _lite suffix, in
favor of a f2c_ prefix for all generated files.

Before:

 * `zlapack_lite.c` - Functions for the `complex128` type.
 * `dlapack_lite.c` - Every other lapack function

After:

 * `f2c_z_lapack.c` - Functions for the `complex128` type.
 * `f2c_c_lapack.c` - Functions for the `complex64` type.
 * `f2c_d_lapack.c` - Functions for the `float64` type.
 * `f2c_s_lapack.c` - Functions for the `float32` type.
 * `f2c_lapack.c`   - Every other lapack function

Compute the sources required to build extensions lapack_lite and
_umath_linalg in a more direct way that doesn't rely on abusing the
'depends' argument to config.add_extension().

Run the 2to3 ws_comma fixer on *.py files. Some lines are now too long
and will need to be broken at some point. OTOH, some lines were already
too long and need to be broken at some point. Now seems as good a time
as any to do this with open PRs at a minimum.

Now is as good a time as any with open PR's at a low.

Also, link umath_linalg against the system BLAS/LAPACK if available.

Add `print_function` to all `from __future__ import ...` statements
and use the python3 print function syntax everywhere.

Closes #3078.

This should be harmless, as we already are division clean. However,
placement of this import takes some care. In the future a script
can be used to append new features without worry, at least until
such time as it exceeds a single line. Having that ability will
make it easier to deal with absolute imports and printing updates.