replace tag

Add the possibility to replace a certain tag in the numodis xml input files. The goal is to allow the use of a single input file for multiple steps of a workflow.

For example the following:

<!--DD0object name="BCCLoop_111burgers112sided"
     		bh="1" bk="-1" bl="1"
     		cx="0" cy="0" cz="0"
     		nSIAs="271" /DD0-->

would be uncommented when specifying "DD0" as a replace tag:

<object name="BCCLoop_111burgers112sided"
     		bh="1" bk="-1" bl="1"
     		cx="0" cy="0" cz="0"
     		nSIAs="271" />