added maximumPacketSize and maximumWaitingData fields for limiting peer buffer space
update license date
fix maximumWaitingData handling to allow acknowledgements when the packet already exists
enet 1.3.12 release prep
upgrade doxygen configuration file
Merge pull request #33 from stephanecharette/master

upgrade doxygen configuration file
doxygen output cleanups
doxygen output cleanups
add doxygen layout
more doxygen cleanups
bold some links
small doc fixes
Merge remote-tracking branch 'upstream/master'
Merge branch 'master' into ipv6