Merge pull request #3 from Noxxik/master

Aggregated Data & Isolation levels demonstration
updated table M:N
merged
bugfix
more users
added filtering
finalizing
Done!

Added Class ConnectionForTransactionLevels where are stored informations about connection to localhost or krizik DB. Still It is not nice, but who cares :D

Also M:N and SQL panels functionality was now completly separated - reset buttons.
SQL's buttons now modify just reservations table