SSH experiments with jsch (com.jcraft) and ganymed-ssh-2
SshExecutor implemented

sdimain.properties:
  - new properties:
    - sdi.target.host
    - sdi.targetjob.ftp.user
    - sdi.targetjob.ftp.password
    - sdi.ssh.user
    - sdi.ssh.password
    - sdi.ssh.port
    - sdi.ssh.checkcertificate
  - sdi.targetjob.ftp.cmdLine: default is now composed out of other values
Several unit tests fixed (ConversionService)
MailCreatorTest: Only testing mail creation and nomore MailTextResolver (dummy for test)
Properties: all declarations ConditionalOnMissingClass removed since not working as expected (SdiMainProperties is not loaded)
sdimain_test.properties deleted
core/pom.xml: slf4j-log4j12 removed