Gives the ERT-engineers a set of inflatables for those lonely shuttle rides.

Glass and metal reserves on the Research outpost now have more than a single sheet of each kind.
Finally found the inflatable duck floating ring that had been replaced with inflatable walls.

Fixed 3 instances, one on the beach holodeck and two in CentCom.
Another two inflatable barrier boxes added.
Merge pull request #5310 from PsiOmegaDelta/ERTInflatables

Inflatables and sheets