Remove TABs from src

Will also make selftest to check that they aren't introduced

More changes to get basis2002 changes working properly in both poly + mosml.

Implement more of Basis2002 for Moscow ML (adding Vector, Array,
ArraySlice and VectorSlice), simplifying what Poly/ML has to emulate.
Haven't done full rebuild test, but have got as far as integerTheory
and Omega, which makes heavy uses of Vector etc.

Removed trailing whitespace from all .sml and .sig files.

This affects over 900 files and was done using emacs's delete-trailing-whitespace
function in batch mode. Building the system with Poly/ML and Moscow ML seems to
work, so I'm hoping these changes don't break anything. Please complain if
they do!

Fix for conflicting behaviour of Moscow ML and PolyML on FileSys.tmpName. Thanks to Scott Owens for spotting and diagnosing the problem, and providing a temporary patch.

This was causing hundreds of empty temporary files to be generated during the
build on PolyML. This quick fix

val tmp = FileSys.tmpName()
- val cnfname = if isSome fname then (valOf fname) else tmp^".cnf";
+ val cnfname = if isSome fname then (valOf fname) else tmp;

isn't ideal, but fixed the bulk of the problem for now. On PolyML, the call to
tmpName() actually creates the file (as per the ML basis standars), and by
adding the suffix, the original file is never removed. There are still obvious
potential cases where the temporary file is created but not used or removed,
but I don't immediately see how to fix them (or indeed what this code does).

Summary: tautLib upgraded to use HolSatLib engine.

Details:
* tautLib signature (and behaviour hopefully!) is unchanged.
Internally, TAUT_CHECK_CONV now uses HolSatLib.
* HolSatLib can now handle Boolean-valued conditionals. This
was forced because tautLib handled them.
* We now have full drop-in support for zChaff, via a proof translator.
* HolSatLib now deletes temporary files.
* Legacy HolSatLib interface dropped in favour of simpler
interface with single entry-point, plus some convenience
wrappers.
* examples/miller/m renamed to selftest.exe; now works with build -selftest
* build-sequence changes: src/compute and src/HolSat/* moved above src/taut;
examples/miller stuff condensed into one entry
* build.sml patched to handle zChaff proof translator (in C++).
* New windows binaries for MiniSat and zChaff proof translator.
* Changes/additions to HolSatLib interface rippled to affected files.
* Documentation updated. In particular, HolSatLib section in Description
had to be almost completely rewritten.
* HOL builds to selftest level 1 on standard kernel, and level 2 on
experimental kernel. Level 2 failures on standard are non-critical
and authors have been informed.

* Implicit definitional CNF (from HOL Light code due to John Harrison),
modified to exploit primitive CONJUNCT* rules in HOL4.
* Optimisations to above for the case where problem is already CNF. This
is handy for SATLIB problems.
* Fallback to SML DPLL prover extended to the case where MiniSat binary
cannot be found or cannot be executed.
* SML DPLL prover modified to use implicit def CNF, and to produce
countermodels in the same format as SAT_TAUT_PROVE.
* Explicit definitional CNF and normalFormsTest files removed, so we can
move HolSatLib up the build-sequence, to follow src/taut.

Some technical improvements:

* HOL-side
- All is now tail recursive and most uses less RAM
- Undocumented feature allows skipping CNF conversion (still WIP)
- General refactoring preparatory to adding proof replay for ZChaff
* Solver-side
- Proof log now indexes root clauses, and writes sign info for pivots
- Proof::compress has been implemented
- Folded in miscellaneous upstream deltas

PS: None of the above applies to defCNF stuff. Still a black box to me.

HolSatLib refactoring and additions.

* MiniSat-p v1.14 added as a "built-in" SAT-solver
* A new function SAT_TAUT_PROVE uses MiniSat to prove propositional
tautologies within HOL
* HolSatLib refactored into satTools and dimacsTools
* Local documentation removed; it was folded into the
Description some time ago.
* The HolSatLib interface remains the same, save for the addition of
SAT_TAUT_PROVE.
* Two minor additions to defCNF: a global ref for the variable name
prefix used by DEF_CNF_VECTOR_CONV (defaulting to the current setting),
and a global ref for the number of new vars introduced by definitional
CNF.