* rename src directory to allocbench
* make global variable names UPPERCASE
* format a lot of code using yapf
* use lowercase ld_preload and ld_library_path as Allocator members
* name expected Errors 'err' and don't raise a new Exception
* disable some pylint messages

Now there is only a single plot function which takes a plot type as
well as some plot and figure options.

add new helper functions to get all y_values for a plot
use seperate figures for each plot
s/filepostfix/file_postfix/ to be consistent

* use str.format instead of eval for plot labels
* use meaningful variable names
* add license header
* add some doc strings

There is no generic way to retrieve the version of a binary.
Not everyone followes GNU cli guidelines and supports "--version".
The larson benchmark for example reads input from stdin when
started with "larson --version" blocking the Benchmark.prepare() call.

servers are now dictionary with two mandatory keys: "name" and "cmd".
Optional keys are:
	* "prepare_cmds": commands are run after a server is started
	* "shutdown_cmds": commands are run before a server is terminated