Log Message:
tex-mcf2graph{,-doc}: update to 4.92

4.91
-update MCF manual
 from this version typeset with LuaTeX
 include mcf_man_soc.mp,mcf_mplib_exa.tex
-delete mcf_man_soc.mp
-delete mcf_mplib_exa.tex
-delete mcf_mplib_exa.pdf

4.92
-change default output
 eps => svg
-update MCFexample
 include mcf_exa_code.tex
-delete mcf_exa_code.tex
-delete mcf_exa_code.pdf