Due to compatibility issues on older platforms (issues discovered on
ARMv7 with GCC 5.2 but may not be limited to this platform) the usage
of C++11 thread- and synchronisation facilities has been reverted to
previous custom OS-specific implementation.
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.
Before scanning of dupe directories the directories are quickly checked
by dupe matcher. It determines if they contain or may contain the same
content. If the dupe checker detects a dupe containing different
content as the download being currently processed by par-checker, such
extra dupe is skipped to save time during dupe par scan.
