[FIX] web_tip: handles `content changed` event in forms; minor fixes

* eval tip on form content changes
* prevent multiple tip trigerring in some cases
* use scrollTo jquery plugin
[ADD] website: new blog demo snippets

(cherry picked from commit 6c6df546eb5a99d00d62fc6b497b4b861431423e)
(closes #2631)
[ADD] Added new report for sale and point of sale analysis,Renamed menu of Orders Analysis into POS Analysis which will show pos order data.

[IMP]Improved query for report,gived access rights for this report and improved qty string.

[IMP]gived access of report to pos user

[MIG]Migrated report in new api,removed icon,improved view and query.

[IMP]Improved query to fix that pos datas is not availabel in report

[IMP]Improved query to differntiate data of so and pos.

[IMP]Improved some labels of report.

[IMP]set sales channel as default group by and move it before product.