Ftrace - A recursive function call tracer for python.

Description
-----------

Ftrace is designed to make it easy to debug the behavior of recursive functions
by printing a function and the parameters it's called with at each invocation.

Use
---

To use ftrace, import the ftrace function:

	from ftrace import ftrace

Then, for any function you want to trace add @ftrace above the definiton:

	@ftrace
	def your_function:
		...

Behavior
--------

When you run the trace, call-depths and ASCII art are printed along with
functions and their parameters. For example, running examples.one(5):

	>>> import examples
	>>> examples.one(5)
		0 one( (5,) {} )
		1 |  two( (4,) {} )
		2 |  |  one( (3,) {} )
		3 |  |  |  two( (2,) {} )
		4 |  |  |  |  one( (1,) {} )
		5 |  |  |  |  |  two( (0,) {} )
		5 |  |  |  |  |  two( (0,) {} ) returns: 0
		4 |  |  |  |  one( (1,) {} ) returns: 1
		3 |  |  |  two( (2,) {} ) returns: 2
		2 |  |  one( (3,) {} ) returns: 3
		1 |  two( (4,) {} ) returns: 4
		0 one( (5,) {} ) returns: 5
	5
	>>> 

Printing the call depth or the ASCII art can be disabled by toggling
ftrace.PRINT_CALLDEPTH_NUM and ftrace.PRINT_ASCII_ART, respectively.