Changes in Mini-XML 2.2.1

• mxmlLoadFd(), mxmlLoadFile(), and mxmlLoadString() now correctly return NULL on error (STR #21)
• mxmlNewInteger(), mxmlNewOpaque(), mxmlNewReal(), mxmlNewText(), and mxmlNewTextf() incorrectly required a parent node (STR #22)
• Fixed an XML output bug in mxmldoc.
• The "make install" target now uses the install command to set the proper permissions on UNIX/Linux/OSX.
• Fixed a MingW/Cygwin compilation problem (STR #18)