MNT: Given that fsl.sh and fsl-devel.sh are pretty much identical, why not

make the latter call the former

etc/fslconf/fsl-devel.sh

-# FSL configuration file
+# FSL configuration file for developers
 #  - to be sourced by the user, typically in .bashrc or equivalent
-#  - note that the user should set
-
+#
 # Written by Mark Jenkinson
 #  FMRIB Analysis Group, University of Oxford
 
 # SHBASECOPYRIGHT
 
-
-#### Set up standard FSL user environment variables ####
-
-# The following variable selects the default output image type
-# Legal values are:  ANALYZE  NIFTI  NIFTI_PAIR  ANALYZE_GZ  NIFTI_GZ  NIFTI_PAIR_GZ
-# This would typically be overwritten in ${HOME}/.fslconf/fsl.sh if the user wished
-#  to write files with a different format
-FSLOUTPUTTYPE=NIFTI_GZ
-export FSLOUTPUTTYPE
-
-# Comment out the definition of FSLMULTIFILEQUIT to enable
-#  FSL programs to soldier on after detecting multiple image
-#  files with the same basename ( e.g. epi.hdr and epi.nii )
-FSLMULTIFILEQUIT=TRUE ; export FSLMULTIFILEQUIT
-
-
-# The following variables specify paths for programs and can be changed
-#  or replaced by different programs ( e.g. FSLDISPLAY=open   for MacOSX)
-
-FSLTCLSH=$FSLDIR/bin/fsltclsh
-FSLWISH=$FSLDIR/bin/fslwish
-
-export FSLTCLSH FSLWISH
-
-# The following variables are used for running code in parallel across
-#  several machines ( i.e. for FDT )
-
-FSLLOCKDIR=
-FSLMACHINELIST=
-FSLREMOTECALL=
-
-export FSLLOCKDIR FSLMACHINELIST FSLREMOTECALL
-
-# The following variables are used to configure CUDA capable queues - if you
-# are using Grid Engine then this queue will be used to enqueue tasks that
-# support execution on NVIDIA CUDA hardware.
-FSLGECUDAQ=cuda.q
-
-export FSLGECUDAQ
-
-# Set up development variables (not for the faint-hearted)
-
 FSLCONFDIR=$FSLDIR/config
 FSLMACHTYPE=`$FSLDIR/etc/fslconf/fslmachtype.sh`
 
 export FSLCONFDIR FSLMACHTYPE
 
-
-###################################################
-### Add other global environment variables here ###
-###      or change the definitions above        ###
-###################################################
-
-
-# USER VARIABLES HERE
-
-
-###################################################
-####    DO NOT ADD ANYTHING BELOW THIS LINE    ####
-###################################################
-
-if [ -f /usr/local/etc/fslconf/fsl.sh ] ; then
-  . /usr/local/etc/fslconf/fsl.sh ;
-fi
-
-
-if [ -f /etc/fslconf/fsl.sh ] ; then
-  . /etc/fslconf/fsl.sh ;
-fi
-
-
-if [ -f "${HOME}/.fslconf/fsl.sh" ] ; then
-  . "${HOME}/.fslconf/fsl.sh" ;
-fi
+source $FSLDIR/etc/fslconf/fsl.sh

etc/fslconf/fsl.sh

 # FSL configuration file
 #  - to be sourced by the user, typically in .bashrc or equivalent
-#  - note that the user should set
-
+#
 # Written by Mark Jenkinson
 #  FMRIB Analysis Group, University of Oxford