Added a test for out-of-bounds character array access.
Factorize type name equality checks in CheckIO.
Merge pull request #324 from simartin/char_array_overrun_test

Added a test for out-of-bounds character array access.
Merge pull request #325 from simartin/checkio_types_match_factorize

Factorize type name equality checks in CheckIO
GUI: Minor image compression improvements.

Before: 24.321 bytes
After:  24.272 bytes

[ci skip]
Fixed CID 1216439: potential copy&paste error in testing symbol database.
cleanup redundant valueflow check. if there are no values the getValue will return NULL.
Fix missing break while handling SIGBUS - fixes clang compiler warning
Ticket #5615: Avoid calling the same function n times when once is enough.
Merge pull request #326 from simartin/ticket_5615_avoid_useless_similar_calls

Ticket #5615: Avoid calling the same function n times when once is enough
Only fill total_size in CheckBufferOverrun::checkFunctionParameter when it's useful.
Fixed #5874 (False positive: 'opposite conditions in nested if' with arrays)
Merge pull request #327 from simartin/only_fill_if_needed

Only fill total_size in CheckBufferOverrun::checkFunctionParameter when useful
Fixed #5857 (strPlusChar: Crash on invalid code 'int+;')
#5875 clang ubsan errors: lib/checkassignif.cpp:58:34: runtime error: member call on null pointer of type 'Token'
TokenList: added assertion that makes sure the Preprocessor doesn't let through extended ascii wrongly.
#5875 Fix 'lib/mathlib.cpp:559:43: runtime error: division by zero'. Several fixes to MathLib::divide(): avoid division by zero, handle various representation of 0 value, use 'nan.' instead of '-nan.0'
astyle run [ci skip]
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.