Remove TABs from src

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

Delete trailing whitespace

quantHeuristicsLib: fix handling of pairs, context cleanup

The heuristic for instantiating product variables was broken.
Nested pairs were broken. Pairs like (a, b, c) worked, while ((a,b), c)
did not. Moreover, context heuristics that recurse are now not any more
part of the basic quant parameter. This stops the quant-heuristics
looping sometimes, when the user isn't careful.

rename Ho_Net.empty_net to Ho_Net.empty

All similar structures (e.g. Net and Raw) use "empty" not "empty_net";
it seems right to follow a single naming convention.

Remove some Unicode in src/

Remove trailing whitespace in src/

minor tweaks on quantHeuristicsLib, adept Holfoot to changes with MEM

experimental tool, suggested by Ramana, for abbreviating subterms using quantifier heuristics
added

quantifierHeuristics tweaks
- some tweaks to make sum_qp behave nicer
- for this some small changes that can be seen as
bug fixes or minor feature improvements

Delete trailing whitespace in src and examples.

quantHeuristicsLib bug fixes

- back-chaining only applied weakening, if a rule could be applied
for both threngthening and weakening
- trouble with free type-variable clashes fixed

quantHeuristicLib tuning
- better name for traces
- list_no_len_qp added
- predefined filter functions added

Delete trailing whitespace in src/

bug-fix in Sanity.sml another cleanup of quantHeuristicsLib

extended interface for quantifier heuristics

Now additional context as well as lemmata used for weakening / strengthening can be added to quantifier heuristic parameters.

Added support for context to quantifier heuristics, add sum_qp

cleanup of quantifier heuristics library

- more sensible names for guesses
- quantHeuristicsLib renamed to quantHeuristicsLibBase
- quantHeuristicsLibArgs renamed to quantHeuristicsLibParameters
- new shorter signature defined in quantHeuristicsLib
- adaptation of usage of quantHeuristicsLib