Add a new test for OpenFile function from windows.cfg.
It is here as a reminder for a TODO. When used with OF_EXIST flag, the function OpenFile doesn't return a handle and thus, doesn't leak any resource.
As cppcheck doesn't support such feature yet, it's added a TODO not to be forgotten for later fix when cppcheck supports this.

Also added a naive check, just to ensure the OpenFile check doesn't get broken when adding support for OF_EXIST.
htmlreport: make link to index page ("Defect list") fixed on the screen so we can always access it regardless of how low we scrolled.
htmlreport: remove redundant <style> tags, make html output readable.
htmlreport: splitup HTML_HEAD where we want to insert the list of errors.
htmlreport: show index of errors of current page under Defect List link.
htmlreport: make content div overflow the menu properly when scrolling horizontally.
Merge pull request #330 from matthiaskrgr/htmlreport_2

Htmlreport: minor cleanup, write index of errors (with links) under "Defect list" in menu for each page
Merge pull request #329 from HeisSpiter/master

Add a new test for OpenFile function from windows.cfg.
htmlreport: print filename in file page heading.
Merge pull request #328 from matthiaskrgr/htmlreport

htmlreport: print filename in file page heading.
#5875 fix 'lib/checksizeof.cpp:142:26: runtime error: member call on null pointer of type 'Token'. Improve error handling in CheckSizeof::checkSizeofForPointerSize()
Fixed #5867 (invalid debug warnung: Scope::checkVariable : varid0)
travis: replace kernel check with clang check.

Check clang instead of kernel, which is a lot faster.
Make clang check failure fatal to the build.
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"
travis: add -DCHECK_INTERNAL to the VERIFY=1 job to automatically fetch issues like #5869 via travis
travis: run cppcheck with --exception-handling where it matters.