With Visual Studio Community 2017 (15.9.5), namespace 'experimental' is present both in 'std' and 'DGtal' namespaces and it produces an error.
Using 'std' namespace explicitly solves the problem.

On Windows 10, with Visual Studio Community 2017 (15.9.5), the file wingdi.h is included. This file alredy defines 'Arc' as a function. Thus Visual produces an error if 'Arc' is declared to define a type. Changing the typedef from 'Arc' to 'ArcT' solves the problem.

When compiling with Visual Studio (tested with 15.9.5), several io tests
(testLongVol, testPNMReader, testVolReader, testCompressedVolWriter)
fail if binary mode is not correctly set for iostreams.
This commit makes these tests pass.

On Windows (with Visual Studio), the call to getline() may be found '\r' before '\n'.
By restricting the header check to only two characters, we avoid this problem.
This change makes testGenericReader and testGenericWriter pass.

Build functors passed to Composer functor explicitly.
This change makes testPNMRawWriter pass (with Visual Studio).