• Add CTIerrorBegin/End call to a CTIerrorContinued call site that was missed in an earlier commit.
• Add end-to-end test for CTIerrorBegin/Continued/End.
• Rename error end-to-end tests to have consistent naming.
• Expand test-error-generic to additionally test line wrapping and custom header arguments.
• Fix inconsistent CTIerror behaviour by moving the CTFinitialize call from OPTcheckOptionConsistency to main.c.