compiler: optimization improvements

* stdlib/optimize.tl (basic-blocks peephole-block): Drop the
code argument, and operate on bl.insns, which is stored
back.  Perform the renames in the rename list after the
peephole pass.
(basic-blocks rename): New method.
(basic-blocks do-peephole-block): Implementation of
peephole-block, under a new name.  The local function called
rename is removed; calls to it go to the new rename method.
(basic-blocks peephole): Simplify code around calls to
peephole-block; we no longer have to pass bl.insns to it,
capture the return value and store it back into bl.insns.

* stdlib/compiler.tl (*opt-level*): Initial
value changes from 6 to 7.
(compiler optimize): At optimization level 6,
we now do another jump threading pass, and
peephole, like at levels 4 and 5. The peephole
optimizations at level 5 make it possible
to coalesce some basic blocks in some cases,
and that opens up the possibility for more
reductions. The previously level 6 optimizations
are moved to level 7.

* txr.1: Updated documentation of optimization levels,
and default value of *opt-level*.

* stdlib/doc-syms.tl: Updated.

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