fix: remove pddl2ltl and remove FDgrounder dependency

the poetry lock has been produced with `poetry lock --no-update`

Author: marfvr

plan4past/exceptions.py

@@ -32,10 +32,6 @@ class ProblemUnsolvableException(BasePlan4PastError):
     """Exception raised when the problem is unsolvable."""
 
 
-class MalformedExpression(BasePlan4PastError):
-    """Malformed expression exception."""
-
-
 class MappingParserError(BasePlan4PastError):
     """Mapping parser error."""
 

plan4past/utils/pddl2ltl.py

@@ -38,7 +38,6 @@ python = ">=3.8.1,<4.0"
 click = "^8.1.3"
 pddl = "^0.3.1"
 pylogics = "^0.2.1"
-FDgrounder = { git = "https://github.com/LBonassi95/downward/", branch = "only-grounder-lib" }
 
 [tool.poetry.group.dev.dependencies]
 bandit = "^1.7.5"

poetry.lock

@@ -38,12 +38,6 @@
 _  # unused function (plan4past/utils/nnf_visitor.py:43)
 _  # unused function (plan4past/utils/nnf_visitor.py:49)
 _  # unused function (plan4past/utils/nnf_visitor.py:55)
-LTL_UNTIL  # unused variable (plan4past/utils/pddl2ltl.py:48)
-LTL_RELEASE  # unused variable (plan4past/utils/pddl2ltl.py:49)
-LTL_ALWAYS  # unused variable (plan4past/utils/pddl2ltl.py:50)
-LTL_EVENTUALLY  # unused variable (plan4past/utils/pddl2ltl.py:51)
-LTL_NEXT  # unused variable (plan4past/utils/pddl2ltl.py:52)
-LTL_WEAKNEXT  # unused variable (plan4past/utils/pddl2ltl.py:53)
 _  # unused function (plan4past/utils/ppnf_visitor.py:46)
 _  # unused function (plan4past/utils/ppnf_visitor.py:52)
 _  # unused function (plan4past/utils/ppnf_visitor.py:58)