It doesn’t return filenames ‘.’ and ‘..’ (for current and parent
directories) anymore, eliminating the need to check and ignore these
names on each usage of the class.
1) for parameters use references to CString instead of pointers to
buffers;
2) when returning strings use CString instead of pointer to char buffer
which caller needs to deallocate;
3) use BString even more.
1) replaced characters arrays with class BString through the whole
program. The string formatting code has become much cleaner.
2) class Util returns error message via CString instead of character
buffers.
3) few more places to use CString.
