pgAdmin 4 commit: Fix "number.toFixed is not function" JS error.

Fix "number.toFixed is not function" JS error.

Issue:
We got the following error in console log
"number.toFixed is not function"

Steps to reproduce:
1) Click on statistics tab.
1) Select any database node.
2) then select Databases collection node.
3) The above error will appear into console.

Reason:
I discussed the issue with @Murtaza and here we are explicitly
converting values at server side to string as JSON do not directly
support NaN & Infinity values. Because of which NumberFormatter receives
values of type string and breaks.

Solution:
Overrides the NumberFormatter to support NaN & Infinity values.
and we need to parse the values again in float at client side.

Branch
------
master

Details
-------
http://git.postgresql.org/gitweb?p=pgadmin4.git;a=commitdiff;h=09569a23bd7f4d91c2789c1c0c5e980959f83dbd
Author: Surinder Kumar <surinder(dot)kumar(at)enterprisedb(dot)com>

Modified Files
--------------
web/pgadmin/static/js/backgrid/backgrid.pgadmin.js | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)