Updated the released files SHA1 sums for 3.0.2.

Also update the version and remove the bit about binaries being provided for
the first time -- this is not true any more.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@77957 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Update version to 3.0.3.

Run misc/scripts/inc_release, update version.bkl and changes.txt manually.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@77958 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Fix several problems with number formatting in wxNumberFormatter.

We shouldn't add thousands separators nor remove trailing zeros for the
numbers in scientific format.

Also avoid "-0" as output.

See #15625.

[This is the backport of r75560 from trunk.]

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@77959 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Fix several rounding problems with float values in wxPropertyGrid.

See also r85980 in the trunk.

Closes #15625.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@77960 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775