The `bool uncaught_exception()' is deprecated since c++17
and is replaced by `int uncaught_exceptions()'.

Only in ERR/WARN/INFO/DBUG/OGS_FATAL and similar, not in
formatted output like xml files.

Also drop the unnecessary 'inline', because of a template function.

Update documentation mismatches in other getConfigAttribute*().

The integer_sequence is available since c++14.

The move ctor is not implemented in gcc < 5.

The reinterpret cast seems to more appropriate in context
of writing of binary values to a stream.

1. Changed urls to https which fixed the following error:

xsd/OpenGeoSysGLI.xsd, at line 1, column 66: Document is not a XML schema.
Error XSDError in ..., at line 3, column 194: Loaded schema file is invalid.

If this error ever pops up again try to cut the internet connection! No joke!

2. Local schema files are now copied to bin-directory during CMake configuration and package generatiion (install step).

Clang format run on near-the-header lines.

Happy New Year

Unfortunately the Visual Studio 2015 does not support
the platform independent style for the function attributes.
Although it is a c++11 standard.