Database synonyms for the victor agent and monitor

Hi all,

this pull request introduces the usage of synonyms for the database accesses in the victor agent and monitor. In addition a script is provided to setup the database schema according to the requirements of the user (e.g. using just one db-admin account or using a reader, writer and admin account structure). This also includes a factorization of the db schemes. This pull request addresses the issues #13, #14 and in parts #18

In addition the script OracleSyn.sh is added (plain copy of the script from phedex) to allow a easy addition of synonyms for accounts in existing databases.

Please feel free to comment.

Cheers,
Rene