Rename the directory for test samples "export/latex/Unicode-characters" to "export/latex/unicodesymbols". This matches the purpose to test the lib/unicodesymbols file.
First run of Kornels patch for tests with all input encodings in lib/encodings.
Remove redundant sample files - keep only one sample and change the input encoding in the test script.
Put remaining failing test in "unreliableTests" for later sorting...
Move them to a subdir, ignore this subdir for other tests.
Dedicated test samples for LaTeX-specific problems don't give additional value if tested for loading, conversion, or other exports.