Improve running tests
Improve running tests

This makes it possible to run unit tests without copying all FDO
files to the output directory.

The environ file now checks if the output directory contains a
`components.map` file. If not it will use the files installed by
lfmerge-fdo. To use locally compiled files from the lfmerge output
directory, copy the FDO files to the output directory and then run
`environ` again.

ermshiperete/LfMerge,sillsdev/LfMerge,sillsdev/LfMerge,ermshiperete/LfMerge,ermshiperete/LfMerge,sillsdev/LfMerge