Refactor temperature in TUI statlines to share code nicer
Avoid using potentially locale-dependent ctype functions in locale-independent contexts
Add framework for using Unicode in TUI (can be disabled with --no-unicode)
Unicode: Use WACS_HLINE for horizontal lines
Unicode: bfg_waddstr wrapper to handle non-ASCII characters, currently used only by logging and statlines
Unicode: If degrees symbol is available, add it to temperatures
Unicode: Use WACS_VLINE for vertical lines
Unicode: Cross-tee intersecting lines
Colour bad conditions in red
Use bfg_waddstr even with Unicode disabled, since it's needed for red highlight
Unicode: Use line drawing in TUI Help
Bugfix: Avoid using wide curses symbols/macros when USE_UNICODE is not defined
Merge branch 'unicode' into bfgminer
Bump version to 3.1.4