[IMP] [MOV] account_analytic_analysis, hr_timesheet
- move the service product from product to hr_timesheet
- move default time unit for services from sale to account_analytic_analysis
to ease the configuration
[ADD] website: new table format snippet

(cherry-picked from 383ab454725d9bf8d01392a587c8a2c0c2116294)
(Closes #2429)
[FIX] Update README for master
[IMP] l10n_pl: some corrections in Polish CoA

PLN as default currency
Many improvements in taxes and fiscal positions
Fixes #825
[ADD] web_pdf_viewer: PDF in-browser preview

This module extends web client and reporting tool in order to allow a
preview of PDF files directly in the browser (if supported by the
browser). If you disable it, standard file download stays available.
[ADD] added website countdown snippet
[IMP] improved counter, added validation + reload-reset problem
[IMP] replaced snippet thumbnail image with FA
[IMP] anonymous user problem solved
[Add] Added button for switching between counter part and release part
[IMP] configured view-port for countdown timer
[imp] removed unnecessary code, removed date srtring parsing instade of that directly used date object from datepicker
[IMP] solved datepicker's z-index issue