Remove 'exclude_testing' attribute for MALI to allow MALI generation
and comparison of MALI hist files for SMS test. Add nl specs for SMS
and ERS tests so that hist.am files are NOT written out as part of
testing (allows hist files to be compared rather than hist.am files).

Added defulat PE layout for BG case using GIS 20km for
Chrys and PM-cpu. Added some additional explicit stub GLC specs
to various new PE layouts (so that these aren't accidentally
'found' and chosen for other layouts w/ an active GLC).

Add BGWCYCL1850 test with 20km GIS; move location of existing IGELM_MLI
tests and support from ./elm component dir to ./mpas-albany-landice dir;
simplify tests so that they all use the same user_nl_mali and shell
scripts.

…km-tests

…km-tests