pic: preserve decimal period in ### overflow fill.

* pic.tl (expand-pic-num): If the overflowing field specifies
a decimal point other than in the rightmost position, then
stick one into the fill pattern. The motivation for this is
that it harmonizes with the digit separators. The new digit
separator insertion logic will treat the # characters like
digits, and requires the embedded decimal in order to work
properly. Allowing digit separation to work in the fill
pattern will make for better looking output in column
displays. That's the same reason why we insert digit
separators among leading zeros.

* tests/018/format.tl: Overflow test cases updated in
light of this requirement change.

* txr.1: Documented.

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