Also, shrunk the corresponding column and the test name column.

Now it can determine, without looking at the file name, both the module
name and the configuration name (the latter with a little help from the
configuration file).

* In comparison column headers, switched the order of labels, so that
  it's "to" vs "from".

* When a test was present, but not run successfully, put its status in
  the corresponding cell instead of coloring it gray.

Otherwise, Excel ignores line breaks in them.

Also, removed the one from modules/python/src2/cv.py and cleared its
executable bit, since it's not a script.

Legend for new column is:
* FASTER - strong speedup
* faster - spedup is detected but it is unreliable
* <empty> - no change in speed
* slower - slowdown is detected but it is unreliable
* SLOWER - strong slowdown

This option provides an easy way to identify tests having no regression data
for sanity checks

* use OPENCV_TEMP_PATH environment variable on all platforms
* fix cleanup after OpenCV tests on Windows
* add --list flag to output names of all tests found
* do not override user-passed --perf_min_samples and --perf_force_samples
  options by --check flag
* fix complier checks inside run.py

* do not lose auto-selected device while running several tests
* reduce output noise
* list available devices if unable to auto-select device
* fix error message when no devices connected