[12gevmoller_sim] [JeffersonLab/remoll] 60d508: Changed target length to 1.25 m

[Wouter Deconinck]

  Branch: refs/heads/bugfix-new-target-length
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  Commit: 60d508c4e25dcb777e321409fa42bfb392d423a3
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  Author: Wouter Deconinck <wdconinc at gmail.com>
  Date:   2019-03-22 (Fri, 22 Mar 2019)

  Changed paths:
    M geometry/target/subTargetRegion.gdml
    M geometry/target/targetDaughter.gdml
    M geometry/target/targetDaughter_Clamshell_Optimized.gdml
    M geometry/target/targetDaughter_acceptanceDefinition.gdml
    M geometry/target/targetDaughter_merged.gdml
    M geometry/target/targetDaughter_noShlds.gdml

  Log Message:
  -----------
  Changed target length to 1.25 m

This propagates the constants
```
    <constant name="tubeTarget_length" value="1250"/>
    <constant name="AlWindowTarget_length" value="0.127"/>
```
and placement of the windows
```
      <physvol>
        <volumeref ref="USAlTarg"/>
<position name="targ_upstream_window" unit="mm" x="0" y="0"
z="-(AlWindowTarget_length+tubeTarget_length)/2"/>
      </physvol>

      <physvol>
        <volumeref ref="DSAlTarg"/>
<position name="targ_downstream_window" unit="mm" x="0" y="0"
z="+(AlWindowTarget_length+tubeTarget_length)/2"/>
      </physvol>

```
in all target implementations.

Asides:
- the `/remoll/targlen` command is likely to disappear since changing
this currently won't move the aluminum windows.