Add a rcond parameter to the polyfit function and give it the double precision

default value that dgelsd uses (rcondx=-1) on the principle of least surprise.
Values of rcond less than this can also be useful, so a warning message and a
bit of explanation was added to the documentation.

The default value used by lstsq was set to the default (-1), and rcond in pinv
has a default value of 1e-15.

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