Function parse

Parser entry points and location-manipulation helpers.

• parse / parseFile — parse Python source (or a file on disk) into an AST.
• literalEval — safely evaluate a literal expression node, mirroring ast.literal_eval.
• fixMissingLocations — fill in missing lineno/col_offset info on a hand-built tree by copying it from parent nodes.
• copyLocation — copy location info from one node to another.
• incrementLineno — shift every line number in a tree by an offset.
• ParseOptions — options accepted by parse.