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Use absolute filename for launching singularity

Chris Burr requested to merge cburr-singularity-abspath into master

In lhcb-datapkg/LbEnvFix!7 (merged) DIRACOS is removed from the application environment. This has the side effect of removing DIRACOS's singularity from PATH and which can cause job launching to fail as LbPlatformUtils decides that singularity is available based on the original value of PATH. This works around the issue by using an absolute filename to the singularity executable that is found before setting up the environment.

Edited by Chris Burr

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