- missing formula elements rewritten to valid defined names (see #680)
- comment author length limit enforced
- XLS ifmt references renamed to numFmtId for consistency with XLSB
- removed circular symlink
- mangle/compress with uglify
- more flow comments
The optional ODS module has been completely merged into xlsx.js and the
corresponding scripts have been removed. The new xlsx.js file provides
appropriate ODS exports, so fixing is a matter of removing ods.js refs.