v0.26.0

• Improved compatibility to types that provide shims stlsoft::c_str_data_a() and stlsoft::c_str_len_a(), rather than stlsoft::c_str_ptr_a();
• Fixed inconsistency in handling of verbosity levels (esp. XTESTS_VERBOSITY_FIRST_CASE_SUMMARY_ON_ERROR);
• Visual C++ compatibility;
• Further application of terse api in example and test programs;
• Various tidyings;
• Improved scope and consistency in example and test programs;
• added support (including coloured output) for (in)equality testing of UDTs;
• temp_directory now finds and deletes sockets (in addition to files);
• fixed defect (when on UNIX) in temp_file;
• now ensures that does not emit ANSI colour sequences when running on Windows on an old terminal that does not support them;
• now uses stlsoft::integral_traits<> for integer test macros (in C++) to allow for custom integral types to be tested;
• temp_file now takes a hint_dir parameter to allow specification of directory for (temporary) file;
• added missing test macros XTESTS_TEST_FLOATINGPOINT_GREATER(), XTESTS_TEST_FLOATINGPOINT_GREATER_OR_EQUAL(), XTESTS_TEST_FLOATINGPOINT_LESS(), XTESTS_TEST_FLOATINGPOINT_LESS_OR_EQUAL();
• added macro XTESTS_COMMANDLINE_PARSE_HELP_OR_VERBOSITY(), which allows for a unified command-line parsing in test programs;
• added terse forms of macros, available by including xtests/terse-api.h;
• XTESTS_COMMANDLINE_PARSE_VERBOSITY() now also recognises, if the command-line argument "--verbosity= . . ." is not found, the enviroment variables "XTESTS_VERBOSITY" and "TEST_VERBOSITY";
• added test programs test.scratch.all_failure_messages, test.scratch.basics2, test.scratch.custom_integral_types,
• substantial internal refactoring;
• minor tidying to CMake facilities;
• minor improvements to examples;
• minor improvements to project boilerplate files;
• updated STLSoft constructs, incl. macros;