#121 Support loading additional java system properties from file

[Anonymous]

Numbering for wrapper.java.additional.n is very inconvinient. It also makes difficult automated wrapper.conf generation.
While using wrapper.ignore_sequence_gaps helps slightly, it would be much better to support loading additional system properties from properties file (in std java format).
Then configuration could look like:
wrapper.java.additional.propertiesfile=./system.properties

This would be very helpful.