Made static local variable non-static (thread-safety, #5934)
Fixed #error handling:
- Reporting them once is enough
- Don't report them if --force is used - since we silently drop these configurations when we check multiple configurations. Without the fix, -f combined with -D resulted in #error being shown erroneously.
- No redundant preprocessor instance to report them
Fixed test_matchcompiler.py
travis: run test_matchcompiler.py
travis: move CHECK_INTERNAL check up, remove "SRCDIR=build VERIFY=1" job in favor of "MAKEFLAGS="HAVE_RULES=yes" SRCDIR=build VERIFY=1"

Conflicts:
	.travis.yml
travis: run cppcheck with --exception-handling where it matters
travis: add -O3 -march=native -mtune=native to default CXXFLAGS
ValueFlow: Improved valueFlowForward. RHS in assignment.
Merge pull request #342 from matthiaskrgr/travis_working

Travis working
htmlreport: Use source_encoding to open XML files
avr.cfg: Added more defines.
avr.cfg: Added accidently commented out define.
avr.cfg: Added macros of stdint.h.
avr.cfg: Removed NAN definition.
ValueFlow: Refactoring. Use utility function isVariableChanged.
ValueFlow: analysis in condition.
avr.cfg: Added support for some stdio.h macros.
htdocs: change link to trac
htdocs: removed files, they have been moved to the repo cppcheck-htdocs
Add VS2013 projects for my personal use (using /LTCG, /MP, /RELEASE, /MT).

[ci skip]