#49 Improve const-correctness

[Markus Elfring]

Would you like to apply the advices from the article "http://en.wikipedia.org/wiki/Const-correctness" to more places in your sources?
I suggest to add the key word "const" to the type specifiers for parameters like the following.
- CfgFileName (function "LoadConfig")
http://efte.svn.sourceforge.net/viewvc/efte/trunk/src/c_config.h?revision=1097&view=markup

- Name (constructor "FileInfo")
http://efte.svn.sourceforge.net/viewvc/efte/trunk/src/s_direct.h?revision=1062&view=markup