Nervatura

- excel report: replaced python xlwt -> node-xlsx
- remove all python dependencies

- new client/server side JavaScript PDF generation: nervatura-report package (jspdf + pdfkit)
- remove public/js/Report.js (-> nervatura-report/dist/report.browser.js)
- move docs/report.html -> nervatura-report/docs
- remove python fpdf package

- NAS: move some special functions to nervatura-express (-> lib/ext/nas.js)
- JEST Testing Framework support (/test dir)

- nervastore: rollback callback function bug fixes
- adapter mysql: charset and insecureAuth (connection options)

- ndi, nervastore, npi, tool: rollback callback function bug fixes

- nervastore getIdFromRefnumber function bug fixes