Add type annotations to avoid warning message.

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.

quantHeuristicsLib: fix handling of pairs

the heuristic for instantiating product variables was broken.
Nested pairs were broken. Pairs like (a, b, c) worked, while ((a,b), c)
did not.

minor tweaks on quantHeuristicsLib, adept Holfoot to changes with MEM

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.

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

A bit more work on list_qp in order to handle LENGTH. For
LENGTH with large numbers, list_len_qp added.
Experimental support for removing redundant function application on
quantified variables 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