Bug #6 - UDP stats scanf has too many arguments

This fixes http://sourceforge.net/p/nicstat/bugs/6/ by applying the
patch I provided in that that bug report.

This resolves the following compiler warning:

nicstat.c: In function ‘load_snmp’:
nicstat.c:1569:8: warning: too many arguments for format [-Wformat-extra-args]
Bug #7 - Remove unused variables

This fixes http://sourceforge.net/p/nicstat/bugs/7/ by applying the
patch I provided in that that bug report.

There are two unused variables in Linux (one is used only for solaris,
the other used nowhere), found when compiling with -Wall.
Update BUGS.md with #6 and #7