Improve error reporting when using OpenFileGDB driver

[jpalmer]

When trying to open a FileGDB using the OpenFileGDB driver and the user does not have permission to read the table file OGR returns a debug message which can be cryptic for a normal user. e.g: Error occurred in xx at line xxx

I've tracked the issue down to this code:

http://trac.osgeo.org/gdal/browser/trunk/gdal/ogr/ogrsf_frmts/openfilegdb/filegdbtable.cpp#L593

Can this be improved to a message like: "Failed to open table xx -Permission denied".

[Even Rouault]

After r28457 "OpenFileGDB: improve error reporting when file exists but cannot be opened due to permission problem (#5838)"

on a directory where files can be listed but the user hasn't read permission:

$ ogrinfo poly.gdb -ro
ERROR 4: Cannot open poly.gdb/a00000001.gdbtable: Permission denied

[jpalmer]

As always just awesome - Thanks Even.

[Even Rouault]

Milestone renamed