Remove some Unicode in src/

Fix bug in Cooper's algorithm; build-sequence at selftest=0 builds.

Progress with #52.

Attempt to fix cooper_conv bug.

COOPER_CONV ``~(&a + &b < 0)`` still fails.

Commented out some profiling code.

Fix for a bug found by Mike. Problem was the use of a theorem's
choice of bound name, which caused a clash with a user's free name.
Genvar to the rescue.

Add an embodiment of the Omega d.p. for use inside the simplifier. It
can perform quite badly on goals with too many disjunctive assumptions
(and ~(x = y) counts as a disjunction).

Remove character number 160 from a comment

Follow-on fixes to changing Term to Parse.Term and Type to Parse.Type
in the quotation pre-processor. A mass of trivial changes, but the
new way of dealing with files containing code that does parsing
(not script files) is to

* grab the ambient grammar(s)
* set the current grammar(s) to the right values
for parsing quotations in the file
* the body of the file
* reset the current grammar to the ambient grammar

For an example, see src/taut/tautLib.sml

Upgraded references to UNBETA_CONV and mk_abs_CONV (both essentially the
same function) and removed implementations because of provision of this
function in Conv.

30 lashes with a wet noodle to mn200! Forgetting to put
structure foo = struct ... end
around some files causes very odd error messages from mosmlc on Windows.

More reorganisation, mainly to remove listTheory as an ancestory wherever
possible (it still persists as a necessary ancestor of CooperCore, but
isn't used un-necessarily elsewhere).
Also sped up phase5 of CooperCore some more.

Total reorganisation of Cooper code. Two ..Core modules can be swapped
in and out of CooperShell to provide "shadow syntax" or my original
implementation of the core phases of the algorithm. Code currently littered
with profiler guff.