pic: test cases and fixes.

* share/txr/stdlib/pic.tl (expand-pic-num): Bug: when a field
overflows, the (rest ...) call truncates the leftmost digit.
A failing test case is (pic "#.#" 12) which produces "2.0"
instead of "12.0".  Firstly, we only need that logic at all in
the zero padding case.  When the number is positive, we stick
in the + request, so we are sure to get a + character. The
rest call then predictably chops off the + rather than a
digit.
(pic-join-opt): Fix two bugs here in the string-string combine
case: using s2 instead of s1, and not splicing in rest.
(expand-pic, pic): Implement tightening for escape sequences.
If ~ is not followed by anything, or not followed by the
documented characters for escaping, it is erroneous.

* format.tl: Battery of new tests.

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