Fr Python bindings don't read FrVect start GPS correctly

framel.py is not accurately reading the start GPS time of an FrAdcData array. Consider the following example:

import framel
import numpy
import pytest


def test_read_write(tmp_path):
    data = numpy.arange(100)
    start = 1126259460.0
    dx = 0.01
    x_unit = "s"
    y_unit = "m"

    framel.frputvect(
        "test.gwf",
        [{
            "name": "V1:TEST",
            "data": data,
            "start": start,
            "dx": dx,
            "x_unit": x_unit,
            "y_unit": y_unit,
            "kind": "PROC",
            "type": 1,
            "subtype": 0,
        }]
    )

    data2, start2, _, dx2, x_unit2, y_unit2 = framel.frgetvect1d("test.gwf", "V1:TEST")
    numpy.testing.assert_array_equal(data, data2)
    assert start == start2
    assert dx == dx2
    assert x_unit == x_unit2
    assert y_unit == y_unit2

The output is

$ python -m pytest test_framel.py
...
FAILED test_framel.py::test_read_write - assert 1126259460.0 == 1126259500.0