test: less MATLAB PDF clutter

MATLAB part of the ACID test reference contained a lot of clutter,
that may ineffectively scale a PDF file as to obtain a properly
cropped PDF file.

Truth is, at the moment it is probably not possible to write robust and
compact code to make MATLAB do this. Especially if subplot figures are
used, this becomes nearly impossible. It is better to keep EPS
with its downsides (e.g. no alpha channel support, some background colors
may be lost, ...) and convert the file later on
print_verbatim_information added in ACID test
ACID: error output to LaTeX cleaned up
format_error_message in ACID

Error handlers had a lot of common code. Extracted into a function
to do the formatting of the error message
disp_error_message added in ACID

Error handlers contained some duplication. Extracted displaying
error messages to the console into a function
ACID: getEnvironment from m2t

m2t>getEnvironment is faster, so ne need to have two implementations
Make: don't do epstopdf

EPSTOPDF should be called by LaTeX, not by the Makefile.

This is done by the `epstopdf` package.
Therefore, when a proper LaTeX installation exists, the test will run.
We get rid of nastiness of setting the PATH and making sure that everything
is accessible from the PATH.

With the current approach, when LaTeX is accessible from the PATH, calling
epstopdf becomes a responsibility of the LaTeX distribution. This means
that we shouldn't care about the PATH: either LaTeX can be called and is
properly configured and everythng will be fine. If LaTeX can't be called,
running epstopdf is useless anyhow, and is unlikely to succeed anyway.
Cleanup: ACID LaTeX output code
testfunction `subplot_colorbar` fixed

Do NOT call `matlab2tikz` from within the actual test case
test: one_point cleaned up
Merge branch 'cleanACID'

Clean-up of ACID test (mostly cosmetics)
EPS to PDF conversion is left to LaTeX package:
 no more mucking about in the make file / MATLAB