Fix calling custom_value when add operation in fomedit
Update grid.base.js

Added namespace for mouseup. Required for cleaning up the event when the grid is getting destroyed. Added additional param, id for namespace since a page can have multiple grid and destroying of one grid should not clear namespace for others.
Update grid.custom.js

Unbinding of mouseup event with proper namespace.
Update grid.base.js

Set res to null. Chrome heap profiler show "res" as unclaimed cause it still see the reference existing at this function.
fixing resetting of selection end editing if onPaging returns 'stop'

Change the order of some lines to prevent resetting of `selarrrow`, `selrow` and `savedRow` if `onPaging` callback returns `'stop'`.
Merge pull request #498 from OlegKi/master

fixing resetting of selection and saved row if onPaging returns 'stop'
Add a weight average  introducing a new summaryDivider option
Merge branch 'master' of git@github.com:tonytomov/jqGrid.git
Fix for firstsortorder when multiSort is on.
Remove the prefix error message in inline edit. The developer can make this in your message.
Merge pull request #496 from kunalkumar/master

Namespace for Mouseup event and Unbinding Call
Remove not needed "(" from the last fix
Merge remote-tracking branch 'upstream/master'
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