Version 4.17

• adjust option frac-math-cmd
• deprecate stoich-print and introduce stoich-format
• lazy boolean evaluation where possible
• fix deprecated file hook
• implement issue #17
• fix issue #18
• fix issue #19
• fix typos in code

Version 4.6

• new option math-scripts
• use LaTeX's new hooks
• get rid of redundant package dependencies and code.