reading gcs.csv & pcs.csv is not locale invariant

[baumann@…]

I have to set the locale to "setlocale(LC_ALL, "C");" before doing an "ogrSpatialRef->importFromEPSG(epsg);". This should be documented somewhere. 

Even better: make the reading of the corresponding CSV files locale invariant by setting the locale to "C" temporarilly during import...

[warmerdam]

Konstantin, 

This is documented in the GDAL FAQ, and affects many aspects of the software.
A few critical points, such as GDALOpen(), do force the C locale temporarily
using the "CPLLocaleC  oLocaleForcer;" guard, but this can be somewhat expensive
so I am hesitant to sprinkle it all through the code. 

I'm going to leave this bug open for a while as a reminder to think further about
this issue. 

[warmerdam]

I have modified ogrspatialreference.cpp's OGRPrintDouble() function to 
produce C locale style numbers with fixes up most problems building WKT
strings.

r10720 in trunk. 

Use CPLAtof() in ogr_fromepsg.cpp since all .csv values are C locale. 

r10721 in trunk.

Still more work needs to be done.

[warmerdam]

Assorted additional locale improvements in :
ogr_srs_validate.cpp
ogr_srs_proj4.cpp
ogr_spatialreference.cpp

r10725

still outstanding: 
proj_strod() use in gdal/port/cpl_conv.cpp (for DMStoDec, etc).