First commit on the ASTBuilder branch
Merge branch 'master' into ASTBuilder
Changes for dict constructors, handle contraints and tester
Merge branch 'master' into ASTBuilder
Handling constants as string and tester development

Good results for conunctive queries so far
Merge branch 'master' into ASTBuilder
AST builder ready to handle conjunctive queries

BuilderTester showed good results for queries with:
- Negation
- Strings as constants
- Coinstrains
- Wildcards
- Everything I guess
Ignore .xml files
Merge branch 'ASTBuilder'