Upgrade instrument helpful for conducting experiments

[spisladqo]

runtests.py is an instrument that helps to run experiments with Vortex.

Ivan Khromov is the original author, and he added the first version in his pull request #1. At that time, the instrument was capable of:

• Configuration of Vortex hardware (threads, warps and cores).
• Configuration of OpenCL tests (creating header files with macroses and given values for them).
• Building the tests, collecting results and visualizing them.

Ivan also added kernels from https://cnugteren.github.io/tutorial/pages/page1.html.

I've added the following to runtests.py:

• Jupiter Notebook was replaced with Python script for the ease of use.
• Regular expressions for collectable statistics.
• Tests can be run under RTL simulation and on FPGA.
• Number of how many times to run every test can be chosen.
• Instrument now saves outputs of tests for later use. When the number of runs is greater than 1, the results are saved in one file.
• Most of normaltests from (https://github.com/spbu-se/measurements). I've set time collection and running normaltests for programs on FPGA by default.

I've also added simple draw.py script that I used to get more details about tests time.

NEW_STACK_BASE_ADDR macros was added to VX_config.vh for future experiments. An instruction on how to use it was also added.