mcpp 2.6-prerelease branch in svn created

2.6-prerelease branch is created in Subversion repository.
To checkout:
svn co https://svn.sourceforge.net/svnroot/mcpp/branches/2.6-prerelease

This is a temporary branch for preparing mcpp-2.6.
Updated points are:

1. Integrated Standard mode and pre-Standard mode into one executable,
differenciating the modes with invocation options.

2. Made stand-alone-build independent on any compiler systems. The
stand-alone-build has the common invocation options regardless of the
compiler systems with which mcpp is compiled.

3. Made compiler-specific-build (which replace the resident preprocessor)
installable into only one compiler-specific directory.

4. Added ports to GCC 4.0, Visual C++ 2005.

5. Removed the support for pre-C90 compilers and compilers on MS-DOS.

6. Renamed "doc" directory as "doc-jp" and "doc.eng" directory as "doc".
Renamed a few files.

7. Removed some redundant files.

8. Updated the documents in root directory and Japanese documents in
"doc-jp" directory accordingly.

The English documents in "doc" directory are not yet updated at all.
Since the to-be-updated parts are very large and I am clumsy in English
writing, it will take a month or more to update the English documents.
Anyone who can help me in Japanese-English translation are welcome!