Update permission settings in fix_permissions.sh

[weaverba137]

This PR modifies the permissions that fix_permissions.sh fixes.

fix_permissions.sh will

• Change group ownership to 'desi'.
• Ensure files and directories are readable by the desi group.
• Optionally, make files readable by apache for http access (with -a option).

and that's it. In particular, no attempt is made to alter group write, user write, or any world permissions.

I need to test before merging, but wanted to get the discussion going.

[sbailey]

+1 . Works as expected (after understanding my umask to update my expectations...)

[weaverba137]

I need to update the test_permissions.sh script and clean up some commented code before merging.

[weaverba137]

This should be ready to merge as soon as final tests pass.