Lmod 8.7.12 for Debian and Ubuntu

Switch mode=user_default conversion to build time not configure time.
Taking Kenneth's suggestion to add where configuration variables are set.
This is shown with --miniConfig or --config.
Unsetting FPATH inside configure.ac to avoid bad interaction with possible K-shell support.
ml now understands "--" to mean stop processing options.
LMOD_FAST_TCL_INTERP is set to true by default. Make fixes to rt/commmon_funcs.sh to turn it off for tests. Except that the end2end test needs it true.
Move cache file location from ~/.lmod.d/.cache/* to ~/.cache/lmod/*
Set FPATH in bash.in so that it works correctly with both Zsh and Ksh.
Issue TACC#594: change cp -p to cp and mv to mv -f in update_lmod_system_spider_cache.in.
Now use UID_MIN from /etc/logins.def otherwise default to UID_MIN to 500 in proj_mgmt/convert_mode.sh

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