Mention automake in the dependencies

Add signal support

We check for signals on most calls to runtime functions in the llvm tier and the bjit and inside the interpreter on some additional places,
because checking on every bytecode is a too large slowdown (>10%).

add formencode test

Fix cpython parser bool operation conversion

Quick fix for issue #1083

Because we only checked for Or's instead of checking for Ands this did not cause any issues except when printing the CFG

sysconfig: adjust paths

Fix finding GMP on FreeBSD

Update adds CMake module for finding GMP
https://github.com/vinzenz/libpypa/pull/50

Fixes: #1017

* use _PyObject_GetDictPtr of cpython implementation

remove unnecessary functor and use lambda expression

support inspecting exited frames (faster version)

this works by copying the last locals state into the BoxedFrame when we exit a function.
As a perf improvement we only create BoxedFrames if _getframe got called or an exception got thrown.

It turned out that our python frame retrieving / updating code was really slow (using libunwind) I replaced it now with
a approach which manually keeps track of the python frames (calling initFrame/deinitFrame every time a functions gets called / exits).
Sadly we can't inline this functions in the llvm tier currently because it uses thread local storage which the JIT does not support.
But I have a prototype which works around the issue with inline asm.
We also store now always the current stmt inside the FrameInfo and in addition the FunctionMetadata.
This made it possible to switch away from libunwind frame introspection for most cases (except deopt and c++ unwinding where we need to access all register)

I think we can further improve the patch in several ways:
 - only copying the vregs array instead of generating the dict which takes more time (because of space overhead and hashing?).
 - refcounting should remove uneccesarry locals updating when no one keeps track of the BoxedFrame anymore.
 - switch to cpythons traceback implementation

Add missing runtime/inline include dependence

I think this was the cause of the 'Python.h not found' errors.

EH frame: use a single allocation for the EH frame + generated code

implement tb_lineno of Traceback

Search for gmake and make when building

Switch to /usr/bin/env sh for portability

Small fixes for Flask

fix docs/UNWINDING.md

Add list of not subclassable class

This removes the 2GB process limitation I ran into.
(With the EH frame format we are using the code offset is specified as a 32bit signed offset)
I checked if aligning the code speeds it up but I did not notice any perf change.

Fixes #1071 (building jemalloc dep on BSD systems)

See also:

- #1068
- https://github.com/neovim/neovim/blame/73dbd14/third-party/CMakeLists.txt#L25
  from neovim, (Apache License v2)

See also: #1069

llvm tier: reduce scratch size

With the new frame introspection we don't need to save additional space for spilling vars which live in regs (except for deopts).
And for deopts we will never need more scratch than the one required for spilling the args.

Disable lxml objectify tests

Fix imp.load_module if the module already exists and ban creating instances of None type