Updates for 3.5 release
added stdlib.h for better reliability on some systems
made some of xf.c's internal (static) routines global
added error for unmatched xf or o context close
applied VCOPY macro
fixed bug in order of global transform arguments
minor optimization
added rev field to XF_SPEC structure to indicate vertex reversal
fixed order of transformation accumulation (serious bug!)
made the -a (array) option work within files as well
bug fixes and enhancements
fix in prototype declaration
various enhancements and fixes
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