Replace MyISAM with InnoDb as table engine

[k00ni]

Reasons against MyISAM:

• It is not ACID compliant
• It is fast on writing data, but slow on reading. I assume, reading is more often than writing. Therefore using InnoDB should result in a performance gain

This stackoverflow thread contains more infos about InnoDB vs MyISAM: https://dba.stackexchange.com/questions/1/what-are-the-main-differences-between-innodb-and-myisam