better names + multisite enhancements

function in admin page used to have too much generic names. Super admin
can now override site and open graph settings for the whole network.
debug

multisite override is not working.
default options if new blog in network

when creating a new blog, default options will be created.
enable network-wide option

the goal is achieved but it seems the framework does not even take into
account mutisite which is uncool :/ I probably have to create my own
fields for network menu
add site option
debug
network options functional
delete debug function
remove multisite loop in uninstall.php

it seems that in multisite looping through blogs to delete options on
each blog does not scale.
remove site network option

this setting is too much tricky with override
add import/export feature
play on translation

manage to actually not have to translate new feature import/export ;)
Merge pull request #12 from TweetPressFr/trunk

Trunk