Use [], not at() when the index is guaranteed to be valid.
htmlreport: on the index page, print stats of which warning ID occured how often.
Merge pull request #372 from Dmitry-Me/dontUseArrayAtWhenItWouldntThrow

Use [], not at() when the index is guaranteed to be valid.
Cache option flags and check them first.
Merge pull request #373 from Dmitry-Me/cacheOptionFlagsAndCheckThemFirst

Cache option flags and check them first.
Use temp variables to avoid repeated actions in code.
Merge pull request #374 from Dmitry-Me/useTempVariablesToAvoidRepeatedActions

Use temp variables to avoid repeated actions in code.
Resolve CID 1214637.
Merge pull request #376 from Dmitry-Me/resolveIssue1214637

Resolve CID 1214637.
Bring declarations closer to where they're needed.
htmlreport: stats: sort primary by occurrences but if several IDs occur equally often, sort them alphabetically.
Merge pull request #377 from Dmitry-Me/bringDeclarationsCloserToWhereTheyreNeeded

Bring declarations closer to where they're needed.
Fix Cppcheck warning. Make function Preprocessor::readpreprocessor static instead of const.
Reuse previously computed values, use more const.
Merge pull request #378 from Dmitry-Me/reusePreviouslyComputedValues

Reuse previously computed values, use more const.
astIsFloat: expression 'floatvar ? 0x40 : 0' is not float
Fixed #6009 (Detect type mismatch in printf-like function when type is returned)
Suspicious string comparison: Refactoring using AST. Fixed FP in Lac.
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: add -DCHECK_INTERNAL to the VERIFY=1 job to automatically fetch issues like #5869 via travis, check clang with --exception-handling