#2 control of command line arguments

[buttay]

The attached patch corrects a typo in the code that
causes wiki2pdf to crash when less than 4 command line
arguments are found, instead of exiting gracefully.

the only modification is the replacement of "exit(-1)"
by "sys.exit(-1)"

Cyril

[buttay]

[buttay]

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correction: this patch applies to wiki2latex.py