Cppcheck 1.80

Cppcheck 1.80 has been released

Checking improvements:
- Added platform for Atmel AVR 8 bit microcontrollers (avr8)
- Better 'callstacks' in cppcheck messages
- Improved gnu.cfg, posix.cfg, wxwidgets.cfg and std.cfg, added motif.cfg
- Various improvements to AST, ValueFlow analysis and template parsing

Command line changes:
- Deprecated command line argument --append has been removed
- New command line argument --plist-output to create .plist files
- New command line argument --output-file to print output to file directly
- Check OpenCL files (.cl)

GUI:
- Support export of statistics to PDF
- Several small usability improvements

Additionally, lots of false positives and bugs have been fixed and several existing checks have been improved.