#65 Split .mm file for better CVS/SVN version control

[jiangx]

FreeMind's .mm output file is XML format, and can be
managed by version control system easily. But some
attributes not suitable for that.

e.g., "FOLDED" attribute saved in .mm file, makes
documents changed frequently and unnecessarily. Why
not saved "FOLDED", "CREATED", "MODIFIED"(it's
CVS/SVN's duty) outside?

I write a patch for this. When saving file, a *.mmx
file is also created. When loading *.mm file, if a
*.mmx file exist, load it at runtime. But the code
needs review and your enhancement.

Patch location:

*http://freemind.sourceforge.net/wiki/index.php/User:Ji
angxin
*User:Jiangxin/Patch_save_extra_attributes_outof_mmfile
*User:Jiangxin/Patch_load_mm_file_with_mmx_file