lark.lark didn't parse grammars that didn't have a trailing newline in the file, but lark itself has no problem parsing those grammars
this change makes lark.lark more accurate in reflecting what grammars are parsed by lark.

using `SIGNED_INT` instead of `INT` more closely matches the the grammar used by lark in `load_grammar.py`

Test print argument to lark.tools.standalone.main

Add print parameter to lark.tools.standalone.main

added test

pull error fix form upstream commit

- add methods for visiting intermediate nodes
- add method to notify subclass of cycles
- support returning iterables of nodes from visit*node_in functions
- remove result and visit return value
- also add children property to PackedNode

requirements for docs

Refactored reconstructor out into tree_matcher