Regression testing.

When changing dictionary or affix rules you may use regression testing.

'make regtest' will generate all possible word derivatives and will try to compare it with previously
generated files. You can check *.diff files in test directory then to see if the resulting change
is what you want.

*.nodups.* files contain all word derivatives without duplications.
*.dups.* files contain all duplication in word derivatives.


'make regtestroll' will make current state as a previous resulting file to compare with.


'make clean' will clean only current rusulting file, temporary and diff files.

'make distclean' will clean previous resulting file as well.