new release 0.14.6

[Pierre Carbonnelle]

Hi,

I'm pleased to announce the release of version 0.14.6.

• Several fixes, including:
• issue #4 : max_ aggregate function had side effects on other clauses
• issue #6 : exceptions were raised in expressions that should not be evaluated
• changeset 59cd787: avoid confusion between similar heads of a functional clause
• add support for slices in pyDatalog programs and dynamic queries
• various code, performance and documentation improvements

Thank you to Leo Antunes for his help identifying and resolving some issues !

There is still a nagging issue when dealing with graphs : #7: hashtag_optimized finds a path, but not the shortest one.  This will take some time to fix.  Before that, I'd like to focus on adding the capability to memoize intermediate results from one query to the next, as long as they are within the same "transaction" : this could dramatically improve the performance of similar successive queries.

Any feedback welcome.

Pierre Carbonnelle