Fix case of menu label

[ci skip]
Add menu screenshots to the documentation
Rebuild the Texinfo manual
Fix markup
Allow proper unloading of Flycheck
Use a proper warning
Remove redundant warning prefix from message
Fix test case

Regression from 3fdb308
Explicitly set directory for quoted includes in Clang and GCC

Allows Flycheck to use source again, while still handling "" includes
correctly.
Explicitly set quoted include dir for GFortran
Merge pull request #456 from flycheck/fix-quoted-includes

Improve handling of "" includes in C/C++/Fortran
Update changelog [#456]
Add Ada syntax checker with GNAT [#414]
Merge pull request #457 from flycheck/ada

Add Ada syntax checker with GNAT
Update changelog and credits [#457] [#414]

[ci skip]
Rebuild texinfo manual

[ci skip]
Improve docstring of flycheck-compile

[ci skip]
Rename scalastyle syntax checker
Fix syntax error
Add release news