Update: build level and monolithic fixes and improvements

Update: build level and monolithic fixes and improvements

Add missing library: fll_file.

Make it even easier to compile against "level" and "monolithic" build processes by providing "--level" and "--monolithic" parameters to the generate.sh script and associated settings files.

Make sure package.sh clears other build modes (when --level is specified, make sur --individual and --monolithic modes are not set).