added unit tests

inc/parser/tests/.htaccess

inc/parser/tests/alltests.all.php

inc/parser/tests/lexer.group.php

inc/parser/tests/lexer.test.php

inc/parser/tests/parser.group.php

inc/parser/tests/parser.test.php

inc/parser/tests/parser_eol.test.php

inc/parser/tests/parser_footnote.test.php

inc/parser/tests/parser_formatting.test.php

inc/parser/tests/parser_headers.test.php

inc/parser/tests/parser_i18n.test.php

inc/parser/tests/parser_links.test.php

inc/parser/tests/parser_lists.test.php

inc/parser/tests/parser_preformatted.test.php

inc/parser/tests/parser_quote.test.php

inc/parser/tests/parser_replacements.test.php

inc/parser/tests/parser_table.test.php

inc/parser/tests/parser_tocsections.test.php

inc/parser/tests/parser_unformatted.test.php

inc/parser/tests/testconfig.php